Littelfuse Sensors Catalog
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PRODUCT CATALOG & DESIGN GUIDE Proximity | Level | Speed | Flow About This Guide This guide provides an introduction to magnetic sensing and options for value-added custom design packages. It also offers practical suggestions for selecting reed switches, reed sensors and Hall effect sensors for a variety of applications. Topic Page Introduction to Magnetic Sensing 2–3 Value-Added Customization 3 Reed Switches 4–5 Hall Effect Sensors 7 Reed Sensors 8–9 Reed Relays 10 Magnetic Actuators 11 Applications 12–15 WHY CHOOSE LITTELFUSE Littelfuse, Inc. is the global leader in circuit protection solutions. Our company offers the broadest spectrum of circuit protection technologies along with products that can be used in any application that requires electrical energy. Complementing our vast portfolio of circuit protection products is a global network of technical support and design expertise. Using our decades of design experience, we help you address unique application challenges and achieve regulatory compliance. 59135 (High-Temperature Flange Mount Reed Sensor) Your Single Source Littelfuse offers the world’s most diverse and extensive circuit protection product line. If we do not have an off-the-shelf product to meet your needs, we will work with you to develop a forward-thinking solution that precisely fits your application. Our goal is to provide the most comprehensive range of options so that you will not have to make compromises in your designs. Testing Support Through our network of Global Labs located in China, Germany, Japan, Mexico, Philippines and the U.S., we design innovative circuit protection solutions and provide customer application support and testing. Our unique capabilities include performance testing, material analysis and regulatory compliance testing. The dedication of our Global Labs ensures the outstanding performance, safety and reliability of our products and support services for our worldwide customer base. 59010 (Ultra-Mini Firecracker) Application Knowledge At Littelfuse, our expertise involves applying reliable and efficient circuit protection solutions, innovative technologies and global resources to address circuit protection challenges in a variety of applications. We utilize a worldwide network of research teams that focus on product development and support, design-in programs and application testing in our Global Labs. MDCG-4 (Reed Switch) Global Support Littelfuse products, application knowledge and technical support are available around the globe. We offer a network of regional customer support offices and hundreds of authorized distributors to assist you with your circuit protection requirements. WHY CHOOSE LITTELFUSE SENSORS Hamlin, now part of Littelfuse, Inc., has a long, rich history of leading the industry in providing magnetic sensing solutions. Our experts are committed to delivering the best products and solutions for your specific needs. 59050 (Overmolded Reed Switch) Our global organization provides: • Custom sensor designs per customer specifications • Vertically integrated manufacturing • In-house magnetic simulation support • Quick turnaround for custom sensor prototypes Quality Assurance Our global manufacturing facilities abide by strict quality assurance requirements and hold the following quality management system registrations: 55140 (Flange Mount Hall Effect Sensor) Littelfuse electronics product portfolio includes Hamlin hamlin.com | littelfuse.com 1 Introduction to Magnetic Sensing Reed Switches A reed switch has two ferromagnetic blades (reeds) contained within a tubular glass envelope that is hermetically sealed at each end. The contacts on each reed blade have a thin layer of precious metal material deposited on them. There is usually nitrogen gas on the inside of the glass envelope to eliminate the presence of oxygen and ensure that the contacts will not oxidize. Reed switches are activated by a permanent magnet or an electromagnet. The reed switch and magnetic field combination is commonly known as the “magnetic circuit.” S N N N S The relative stiffness of the reed blades along with the S N N small gap and overlap between the two contacts controls the sensitivity of the reed switch. The sensitivity of the switch is the amount of magnetic field that is required to actuate the contact an open or closed mode. It is measured in S N units of ampere-turns (AT). Most reed switches have a sensitivity range of 10–30 AT, where 10 AT is more sensitive than 30 AT. Y mm S Hold OPEN Hold Close X mm Y MAGNET N N MAGNET S -X X Figure 2-Two-pole linear activation, parallel orientation Close O -X mm OPEN Hold Close O -X mm Y mm OPEN X mm Y S -X X Figure 3-Single-pole linear activation, perpendicular orientation Reed Sensors S N S Figure 1-Magnetic field lines must be aligned parallel to a reed switch’s contacts in order to open/close the contacts Reed sensors are reed switches that are packaged within an external housing for simplified mounting/ connecting and additional protection against environmental influences. These sensors are typically mounted in mechanical systems. A bare reed switch can easily be mounted on circuit boards. However, for an application such as a door security sensor, the reed switch needs a protective shell/housing for handling and mounting. These packages offer resistance to mechanical stress by protecting the bare glass of the reed switch. Reed Relays A reed relay is made by combining a reed switch with a copper coil. Like other relays, this provides galvanic isolation between the coil input and the controlled contact(s). However, because of the small size and magnetic efficiency of the reed switch, the power required to drive the coil is lower than most other types of relays. Other advantages include high insulation resistance, low contact resistance and long contact life. Reed relays are used in many applications, including automotive, test equipment, security, medical and process control equipment. Reed Switch Comparing Reed vs. Hall Effect Although there are differences between reed switch and Hall effect technologies, both platforms offer practical advantages for various applications. Here is a comparison of the benefits of each technology. 2 Littelfuse electronics product portfolio includes Hamlin • • • Hall Effect Sensor Noncontact sensing element • Zero power consumption High-Frequency operation • Digital switching • Linear sensing • Integrated circuitry • Ultra-small package size • • Electrical load capability • EMC/ESD immunity Hall Effect Sensors A Hall effect device is a semiconductor-based integrated circuit with Hall plates that respond to magnetic fields. Additional circuitry is added for power supply and signal conditioning, temperature compensation and EMC/ESD protection. Hall effect devices provide digital or analog output signals that are used for proximity and continuous rotary or linear positioning. Unlike a reed switch, a Hall effect device contains active circuitry, so it draws a small amount of current at all times. Hall effect devices come in two- or three-wire versions. Some devices are programmable. Magnetic Actuators Littelfuse offers a wide range of magnetic actuators that are packaged in shapes similar to the relative mating sensors. We also offer a limited family of bare magnets with various grades of materials, including ferrite (ceramic), AlNiCo and neodymium iron boron (NdFeB) materials. Value-Added Customization Littelfuse specializes in custom design packages that meet our customers’ needs for both reed and Hall effect sensor designs. Several of our vertically integrated processes are listed below. Joining/Sealing Methods • Ultrasonic welding • Heat staking Encapsulation • Transfer overmold • Low-pressure overmold • Epoxy/urethane • Meter/mix dispensing Assembly Methods • Automated • Cellular • Manual 100% End of Line Testing • Hermetic seal test • Magnetic actuation • Contact resistance Circuit Board Assembly • Vision systems • In-circuit test • Pick and place • Reflow • Wave • Robotic Custom Magnet Solutions • Magnetic simulation and modeling for customer-specific designs • Integral magnets within the sensor • Magnetic circuits with tight tolerances available PACK Terminations • Injection molding • Insert molding • Automatic cut, strip and crimp • Littelfuse applies many customer-specified connectors Reed Switch and Hall Effect • Automatic switch assembly machines • Custom reed switch forming equipment • Automated testing • Automatic cut and form • Tape & reel packaging for SMD and other custom design requirements hamlin.com | littelfuse.com 3 Reed Switches Power Size Terminals Leads Small Switch Type Package P/N Body Length (mm)/[Inch] Total Length (mm)/[Inch] A: SPST-NO Glass MITI-7 7.00 [.276] 40.38 [1.590] A: SPST-NO Glass MDSR-10 10.16 [.400] 40.38 [1.590] A: SPST-NO Glass MDSR-7 12.70 [.500] 40.38 [1.590] A: SPST-NO Glass MISM-7 7.00 [.276] 13.72 [.540] A: SPST-NO Glass MDSM-10 10.16 [.400] 15.62 [.615] A: SPST-NO Glass FLEX-14 14.00 [.551] 44.30 [1.744] A: SPST-NO Glass MDCG-4 15.24 [.600] 40.38 [1.590] A: SPST-NO Glass MACD-14 14.00 [.551] 44.30 [1.744] C: SPDT-CO Glass MDRR-DT 14.73 [.580] 51.66 [2.034] A: SPST-NO Glass MDSM-4 15.24 [.600] 19.30 [.760] A: SPST-NO Glass MASM-14 14.00 [.551] 44.30 [1.744] C: SPDT-CO Glass MDSM-DT 14.73 [.580] 25.40 [1.00] A: SPST-NO Overmolded 59165 16.00 [.630] 20.20 [.795] A: SPST-NO Overmolded 59166 16.00 [.630] 19.51 [.768] A: SPST-NO Overmolded 59170 11.43 [.450] 16.25 [.640] A: SPST-NO Overmolded 59045-1 17.78 [.700] 15.24 [.600] A: SPST-NO Overmolded 59050-1 22.86 [.900] 20.32 [.800] A: SPST-NO Glass HA15-2 15.24 [.600] 40.38 [1.590] A: SPST-NO Glass MLRR-4 15.24 [.600] 40.38 [1.590] A: SPST-NO Glass MLRR-3 15.24 [.600] 56.64 [2.230] A: SPST-NO Glass MARR-5 19.69 [.775] 56.77 [2.235] A: SPST-NO Glass MLSM-4 15.24 [.600] 19.56 [.770] A: SPST-NO Glass MLSM-3 15.24 [.600] 19.56 [.770] A: SPST-NO Overmolded 59050-2 22.86 [.900] 20.32 [.800] A: SPST-NO Glass MRPR-3 19.69 [.775] 56.64 [2.230] A: SPST-NO Glass MRPR-8 20.32 [.800] 56.64 [2.230] A: SPST-NO Glass DRR-129 50.80 [2.000] 82.55 [3.250] C: SPDT-CO Glass DRR-DTH 39.67 [1.562] 85.73 [3.375] C: SPDT-CO Glass DRT-DTH 39.67 [1.562] 85.73 [3.375] SMD MACD-14 Leads Low Power SMD MITI-7 Medium Both Leads and SMD MDSM-4 Leads Leads Medium SMD DRR-DTH High Power Leads Leads Large 4 Littelfuse electronics product portfolio includes Hamlin Notes: For details on electrical specifications, visit hamlin.com A:SPST-NO - Single Pole Single Throw - Normally Open C:SPDT-CO - Single Pole Double Throw - Changeover Switching Power (W) Switching Voltage (V) Switching Current (A) Contact Resistance (Ω) Operating Temperature (°C) Magnetic Sensitivity (AT) 10 170 Vdc, 120 Vac 0.25 Adc, 0.18 Aac 0.15 -40 to +125 6-20 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.12 -40 to +125 10-25 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-25 RoHS 10 170 Vdc, 120 Vac 0.25 Adc, 0.18 Aac 0.15 -40 to +125 6-20 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.12 -40 to +125 10-25 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-30 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 12-38 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-30 RoHS 5 175 Vdc, 120 Vac 0.25 Adc, 0.18 Aac 0.1 -40 to +125 15-30 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 12-38 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-30 RoHS 5 175 Vdc, 120 Vac 0.25 Adc, 0.18 Aac 0.1 -40 to +125 15-30 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-25 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-26 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.15 -40 to +125 10-25 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.2 -40 to +105 15-30 RoHS 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.2 -40 to +105 12-33 RoHS 20 200 Vdc, 265 Vac 0.5 Adc, 0.35 Aac 0.1 -20 to +125 17-38 RoHS 20 200 Vdc, 140 Vac 1.0 Adc, 0.7 Aac 0.1 -40 to +125 17-38 RoHS 20 200 Vdc, 140 Vac 1.0 Adc, 0.7 Aac 0.1 -40 to +125 17-38 RoHS 10 1000 Vdc, 700 Vac 0.5 Adc, 0.35 Aac 0.1 -75 to +125 17-38 RoHS 20 200 Vdc, 140 Vac 1.0 Adc, 0.7 Aac 0.1 -40 to +125 17-38 RoHS 20 200 Vdc, 140 Vac 1.0 Adc, 0.7 Aac 0.1 -40 to +125 17-38 RoHS 20 200 Vdc, 265 Vac 0.5 Adc, 0.35 Aac 0.2 -20 to +105 17-33 RoHS 50 200 Vdc, 140 Vac 1.5 Adc, 1.1 Aac 0.1 -40 to +125 22-43 RoHS 50 250 Vdc, 265 Vac 1.0 Adc, 0.7 Aac 0.1 -20 to +125 22-43 RoHS 100 400 Vdc, 280 Vac 3.0 Adc, 2.1 Aac 0.1 -40 to +125 42-83 RoHS 30 500 Vdc, 350 Vac 0.5 Adc, 0.35 Aac 0.125 -20 to +125 50-80 RoHS 50 500 Vdc, 350 Vac 1.5 Adc, 1.0 Aac 0.5 -20 to +125 50-80 RoHS Certification RoHS Compliance MDSM-DT 59165 59045 MRPR-3 Lead Modifications Littelfuse can cut and/or form the reed switch leads to meet your dimensional requirements. Most lead modifications can be done by Littelfuse without any additional tooling costs. hamlin.com | littelfuse.com 5 Sensors, Reed Relays and Magnetic Actuators Our reed switch, Hall effect sensor and reed sensor products are ideally suited for various sensing applications, including proximity, level, speed and flow, as shown in the table. Customizations, including various connectors and wire lengths, are available for all our standard products. For product specifications and available options, refer to the individual product datasheets. Sensor Type Reed Switches Application Proximity Level Speed Flow • • • • • • Hall Effect Sensors Flat Pack • Round Flange Mount Flat Flange Mount • • • Threaded Barrel Vane • • • • Rotary/Angular • Reed Sensors Firecracker • • • Threaded Barrel • • • Flange/Flat Pack • • • Float 6 • • Vane • Lever Arm • Seat Occupancy • Littelfuse electronics product portfolio includes Hamlin • Hall Effect Sensors FLAT PACK This sensor’s rectangular package is ideally suited for mounting on a flat surface. It is designed for use in a wide range of environments. Product Series 55140 Operating Supply Voltage Operating Supply Current mA LxWxH Vdc Max. Flange Mount Hall, 2-Wire 23.00 (0.906) x 14.00 (0.551) x 6.00 (0.236) 3.75 to 24 N/A Overall Dimensions Description mm (inch) Output Type Current Flange Mount Hall, 3-Wire 23.00 (0.906) x 14.00 (0.551) x 6.00 (0.236) 3.8 to 24 N/A Voltage Flange Mount Hall, Analog 23.00 (0.906) x 14.00 (0.551) x 6.00 (0.236) 4.5 to 5.5 N/A 55300 Flat Pack Rotary Hall 28.50 (1.122) x 20.40 (0.803) x 6.35 (0.250) 4.5 to 5.5 16 55310 Flat Pack Digital Hall 28.50 (1.122) x 20.40 (0.803) x 6.35 (0.250) 4.75 to 24 6 55320 Flat Pack Linear Hall 28.50 (1.122) x 20.40 (0.803) x 6.35 (0.250) 4.5 to 5.5 16 Analog Voltage Analog Voltage or PWM Current Analog Voltage or PWM Output High Output Low Temperature Rating ˚C Max. Operating Storage N/A Sinking/Open Collector 4.65 V 2.2 - 5.6 mA -40 to +100 -65 to +105 0.4 V @ 20 mA -40 to +100 -65 to +105 0.35 V -40 to +100 -65 to +105 4.5 V 0.5 V -40 to +105 -65 to +105 N/A 20 mA -8 to +8 mA 0.5 to 4.5 V -40 to +105 -65 to +105 -40 to +105 -65 to +125 N/A ROUND FLANGE MOUNT Its cylindrical package has a flat flange to accommodate mounting on a flat surface. This sensor is ideally suited for sensing a rotating ferrous metal target. Overall Dimensions Product Series Description 55505 Flange Mount Geartooth Hall mm (inch) LxWxH 17.86 (0.703) x 36.75 (1.447) x 41.40 (0.551) Operating Supply Voltage Vdc Operating Supply Current mA Output Type Output High 4.75 to 24 N/A Digital Vdd-2 Output Low Max. 0.6 V @ 20 mA Temperature Rating ˚C Operating Storage -40 to +125 -65 to +125 FLAT FLANGE MOUNT The low-profile, rectangular package is designed for installation in small-gap spaces. LxWxH Operating Supply Voltage Vdc Operating Supply Current mA Output Type Output High Miniature Flange Mount Hall, 2-Wire 25.50 (1.004) x 11.00 (0.433) x 3.00 (0.118) 3.75 to 24 N/A Current N/A Sinking/Open Collector 4.65 V Overall Dimensions Product Series 55100 55110 mm (inch) Description Miniature Flange Mount Hall, 3-Wire 25.50 (1.004) x 11.00 (0.433) x 3.00 (0.118) 3.8 to 24 N/A Voltage Miniature Flange Mount Hall, Analog 25.50 (1.004) x 11.00 (0.433) x 3.00 (0.118) 4.5 to 5.5 N/A Analog Voltage LED Flange Mount Hall 34.00 (1.399) x 14.00 (0.551) x 10.00 (0.394) 3.8 to 24 N/A Voltage Output Low Temperature Rating ˚C Max. Operating Storage N/A -40 to +100 -65 to +105 0.4 V @ 10 mA -40 to +100 -65 to +105 0.35 V -40 to +100 -65 to +105 -40 to +85 -65 to +85 Vdd-2 @ 0.1 mA 0.4 V @ 20 mA VANE This sensor is packaged with a magnet and a Hall effect sensing element. It is typically used in applications with a moving ferrous metal part. LxWxH Operating Supply Voltage Vdc Operating Supply Current mA Out put Type Output High 28.00 (1.102) x 13.50 (0.531) x 9.00 (0.354) 3.8 to 24 N/A Voltage Sinking/Open Collector Overall Dimensions Product Series Description 55085 Miniature Vane, PCB Mount, Hall mm (inch) Output Low Temperature Rating ˚C Max. Operating Storage 0.4 V @ 20 mA -40 to +100 -65 to +105 THREADED BARREL Designed for harsh environments, this sensor may easily be mounted and adjusted using the supplied retaining nuts. Its cylindrical package is available with metric threads. Thread Pitch x L Operating Supply Voltage Vdc Operating Supply Current mA Output Type Output High M12 x 1 Pitch x 46.00 (1.811) 4.75 to 25.2 N/A Digital Vdd - 2 Overall Dimensions Product Series Description 55075 Stainless Steel M12 Geartooth Hall mm (inch) Output Low Temperature Rating ˚C Max. Operating Storage 0.6 V @ 20 mA -40 to +85 -65 to +85 ROTARY/ANGULAR This sensor is packaged with a magnet and a Hall effect sensing element. It provides instantaneous angular position measurement. Overall Dimensions Product Series 55250 Description mm (inch) LxWxH Rotary Hall 50.00 (1.968) x 37.30 (1.469) x 28.25 (1.112) Operating Supply Voltage Vdc 4.5 to 5.5 Operating Supply Current mA Output Type Output High 16 Analog Voltage or PWM 4.5 V Output Low Temperature Rating ˚C Max. Operating Storage 0.5 V -40 to +125 -65 to +125 hamlin.com | littelfuse.com 7 Sensors, Reed Relays and Magnetic Actuators (continued) Reed Sensors FIRECRACKER This sensor offers a slim, cylindrical package that is suitable for mounting on a frame. Product Series Description mm (inch) Contact Rating W Switching Voltage Vdc Breakdown Voltage Vdc Switching Current A Contact Resistance, Initial Ohms ØxL Max. Max. Min. Max. Max. 59010 Ultra-Mini Firecracker 3.13 (0.123) x 9.00 (0.354) 10 170 175 0.25 0.25 57020 59020 Mini Firecracker 5.10 (0.201) x 15.24 (0.600) 10 170 175 0.25 0.25 57020 59021 Aluminum Mini Firecracker 5.10 (0.201) x 15.24 (0.600) 10 170 175 0.25 0.25 57020 Firecracker, Normally Open 6.22 (0.245) x 25.40 (1.000) 10 200 250 0.5 0.2 Firecracker, Normally Open High Voltage 6.22 (0.245) x 25.40 (1.000) 10 300 450 0.5 0.2 Firecracker, Changeover 6.22 (0.245) x 25.40 (1.000) 5 175 200 0.25 0.2 Firecracker, Normally Closed 6.22 (0.245) x 25.40 (1.000) 5 175 200 0.25 0.2 Firecracker, Normally Open 6.22 (0.245) x 38.10 (1.500) 10 200 250 0.5 0.2 Firecracker, Normally Open High Voltage 6.22 (0.245) x 38.10 (1.500) 10 300 450 0.5 0.2 Firecracker, Changeover 6.22 (0.245) x 38.10 (1.500) 5 175 200 0.25 0.2 Firecracker, Normally Closed 6.22 (0.245) x 38.10 (1.500) 5 175 200 0.25 0.2 59025 59030 Overall Dimensions Mating Actuator 57025 57030 FLOAT Designed for liquid-level sensing applications, this sensor has an integral float magnet and a reed switch. Product Series 59630 59300 mm (inch) Contact Rating W Switching Voltage Vdc Breakdown Voltage Vdc Switching Current A Contact Resistance, Initial Ohms ØxL Max. Max. Min. Max. Max. 23.70 (0.930) x 43.70 (1.720) 10 200 250 0.5 0.2 23.70 (0.930) x 43.70 (1.720) 10 300 450 0.5 0.2 Float Sensor, Changeover 23.70 (0.930) x 43.70 (1.720) 5 175 200 0.25 0.2 Float Sensor, Normally Closed 23.70 (0.930) x 43.70 (1.720) 5 175 200 0.25 0.2 Level Sensor, Normally Open (Float Not Included) 19.90 (0.783) x 67.55 (2.660) 10 200 250 0.5 0.2 Overall Dimensions Description Float Sensor, Normally Open Float Sensor, Normally Open High Voltage VANE Packaged with a magnet and a reed switch, this sensor is typically used in applications with a moving ferrous metal part. Product Series 59085 59090 mm (inch) Contact Rating W Switching Voltage Vdc Breakdown Voltage Vdc Switching Current A Contact Resistance, Initial Ohms LxWxH Max. Max. Min. Max. Max. 25.40 (1.000) x 19.05 (0.750) x 6.35 (0.250) 5 175 200 0.25 0.2 25.40 (1.000) x 19.05 (0.750) x 6.35 (0.250) 5 175 200 0.25 0.2 Vane Sensor, Normally Closed 25.40 (1.000) x 19.05 (0.750) x 6.35 (0.250) 10 200 250 0.5 0.2 Vane Sensor, Normally Closed High Voltage 25.40 (1.000) x 19.05 (0.750) x 6.35 (0.250) 10 300 450 0.5 0.2 Heavy Duty Vane Sensor, Normally Closed 32.50 (1.280) x 32.25 (1.271) x 23.25 (0.915) 10 200 250 0.5 0.2 Heavy Duty Vane Sensor, Normally Closed High Voltage 32.50 (1.280) x 32.25 (1.271) x 23.25 (0.915) 10 300 450 0.5 0.2 Heavy Duty Vane Sensor, Changeover 32.50 (1.280) x 32.25 (1.271) x 23.25 (0.915) 5 175 200 0.25 0.2 Overall Dimensions Description Vane Sensor, Normally Open Vane Sensor, Changeover SEAT OCCUPANCY Packaged with an integral magnet and a reed switch, this sensor is available in a push-button configuration or a dome configuration for weight/load distribution. mm (inch) Contact Rating W Switching Voltage Vdc Breakdown Voltage Vdc Switching Current A Contact Resistance, Initial Ohms LxWxH Max. Max. Min. Max. Max. 32.51 (1.280) x 26.67 (1.050) x 37.34 (1.470) 10 200 250 0.5 0.2 10 200 250 0.5 0.2 Overall Dimensions Product Series Description 59250 Push-button Seat Sensor (Reed) 59251 Seat Sensor with Dome (Reed) 108.20 (4.260) x 69.85 (2.750) x 39.88 (1.570) 8 Littelfuse electronics product portfolio includes Hamlin THREADED BARREL Designed with a cylindrical package, this sensor is available with English and metric threads. It may easily be mounted and adjusted using the supplied retaining nuts. Product Series 59060 59065 59070 59075 Description mm (inch) Contact Rating W Thread Pitch x L Max. Max. Min. Max. Max. Stainless Steel Threaded Barrel Sensor, Normally Open M8 x 1.25 Pitch x 36.00 (1.420) 10 200 250 0.5 0.2 Stainless Steel Threaded Barrel Sensor, Normally Open High Voltage M8 x 1.25 Pitch x 36.00 (1.420) 10 300 450 0.5 0.2 Stainless Steel Threaded Barrel Sensor, Changeover M8 x 1.25 Pitch x 36.00 (1.420) 5 175 200 0.25 0.2 Stainless Steel Threaded Barrel Sensor, Normally Closed M8 x 1.25 Pitch x 36.00 (1.420) 5 175 200 0.25 0.2 Overall Dimensions Switching Voltage Vdc Breakdown Voltage Vdc Switching Current A Contact Resistance, Initial Ohms Threaded Barrel Sensor (Standard), Normally Open (5/16 x 24) Pitch x 38.10 (1.500) 10 200 250 0.5 0.2 Threaded Barrel Sensor (Standard), Normally Open High Voltage (5/16 x 24) Pitch x 38.10 (1.500) 10 300 450 0.5 0.2 Threaded Barrel Sensor (Standard), Changeover (5/16 x 24) Pitch x 38.10 (1.500) 5 175 200 0.25 0.2 Threaded Barrel Sensor (Standard), Normally Closed (5/16 x 24) Pitch x 38.10 (1.500) 5 175 200 0.25 0.2 Threaded Barrel Sensor (Metric), Normally Open M8 x 1.25mm Pitch x 38.10 (1.500) 10 200 250 0.5 0.2 Threaded Barrel Sensor (Metric), Normally Open High Voltage M8 x 1.25mm Pitch x 38.10 (1.500) 10 300 450 0.5 0.2 Threaded Barrel Sensor (Metric), Changeover M8 x 1.25mm Pitch x 38.10 (1.500) 5 175 200 0.25 0.2 Threaded Barrel Sensor (Metric), Normally Closed M8 x 1.25mm Pitch x 38.10 (1.500) 5 175 200 0.25 0.2 Heavy Duty Threaded Barrel, Normally Open M12 x 1mm Pitch x 46.00 (1.810) 10 200 250 0.5 0.2 Heavy Duty Threaded Barrel, Normally Open High Voltage M12 x 1mm Pitch x 46.00 (1.810) 10 300 450 0.5 0.2 Heavy Duty Threaded Barrel, Changeover M12 x 1mm Pitch x 46.00 (1.810) 5 175 200 0.25 0.2 Heavy Duty Threaded Barrel, Normally Closed M12 x 1mm Pitch x 46.00 (1.810) 5 175 200 0.25 0.2 Mating Actuator 57060 57065 57070 57075 FLANGE/FLAT PACK This sensor offers a rectangular package that is designed for mounting on a flat surface. It is suitable for use in a wide range of environments, including high-temperature applications. Product Series 59105 59125 59135 59140 59141 59145 59150 Description mm (inch) Contact Rating W LXWXH Max. Max. Min. Max. Max. Terminal Flange Mount Sensor, Normally Open 40.17 (1.582) x 19.05 (0.750) x 6.60 (0.260) 10 200 250 0.5 0.2 Terminal Flange Mount Sensor, Normally Open High Voltage 40.17 (1.582) x 19.05 (0.750) x 6.60 (0.260) 10 300 450 0.5 0.2 Terminal Flange Mount Sensor, Normally Closed 40.17 (1.582) x 19.05 (0.750) x 6.60 (0.260) 5 175 200 0.25 0.2 Overall Dimensions Switching Voltage Vdc Breakdown Voltage Vdc Switching Current A Contact Resistance, Initial Ohms Pinned Flange Mount Sensor, Normally Open 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 10 200 250 0.5 0.2 Pinned Flange Mount Sensor, Normally Open High Voltage 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 10 300 450 0.5 0.2 Pinned Flange Mount Sensor, Normally Closed 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 5 175 200 0.25 0.2 High-Temp Flange Mount Sensor, Normally Open 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 10 200 250 0.5 0.2 High-Temp Flange Mount Sensor, Normally Open High Voltage 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 10 300 450 0.5 0.2 High-Temp Flange Mount Sensor, Changeover 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 5 175 200 0.25 0.2 High-Temp Flange Mount Sensor, Normally Closed 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 5 175 200 0.25 0.2 Mini Flange Mount Sensor, Normally Open 23.0 (0.906) x 14.00 (0.551) x 6.00 (0.236) 10 200 250 0.5 0.2 Mini Flange Mount Sensor, Normally Open High Voltage 23.0 (0.906) x 14.00 (0.551) x 6.00 (0.236) 10 300 450 0.5 0.2 Mini Flange Mount Sensor, Changeover 23.0 (0.906) x 14.00 (0.551) x 6.00 (0.236) 5 175 200 0.25 0.2 Mini Flange Mount Sensor, Normally Closed 23.0 (0.906) x 14.00 (0.551) x 6.00 (0.236) 5 175 200 0.25 0.2 Mini Flange Mount Sensor, Normally Open 23.0 (0.906) x 14.00 (0.551) x 6.00 (0.236) 10 200 250 0.5 0.2 Mini Flange Mount Sensor, Normally Open High Voltage 23.0 (0.906) x 14.00 (0.551) x 6.00 (0.236) 10 300 450 0.5 0.2 Mini Flange Mount Sensor, Changeover 23.0 (0.906) x 14.00 (0.551) x 6.00 (0.236) 5 175 200 0.25 0.2 Mini Flange Mount Sensor, Normally Closed 23.0 (0.906) x 14.00 (0.551) x 6.00 (0.236) 5 175 200 0.25 0.2 Flange Mount Sensor, Normally Open 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 10 200 250 0.5 0.2 Flange Mount Sensor, Normally Open High Voltage 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 10 300 450 0.5 0.2 Flange Mount Sensor, Changeover 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 5 175 200 0.25 0.2 Flange Mount Sensor, Normally Closed 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 5 175 200 0.25 0.2 Flange Mount Sensor, Normally Open 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 10 200 250 0.5 0.2 Flange Mount Sensor, Normally Open High Voltage 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 10 300 450 0.5 0.2 Flange Mount Sensor, Changeover 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 5 175 200 0.25 0.2 Flange Mount Sensor, Normally Closed 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) 5 175 200 0.25 0.2 Mating Actuator 57105 57125 57135 57140 57140 57145 57150 LEVER ARM This clip frame sensor with a lever arm is ideally suited for paper-path sensing and security system applications. mm (inch) Contact Rating W Switching Voltage Vdc Breakdown Voltage Vdc Switching Current A Contact Resistance, Initial Ohms LxWxH Max. Max. Min. Max. Max. 24 (0.945) x 23 (0.906) x 10 (0.394) 10 200 250 0.5 0.2 Overall Dimensions Product Series Description 59210 Lever Arm Sensor hamlin.com | littelfuse.com 9 Sensors, Reed Relays and Magnetic Actuators (continued) Reed Relays DUAL-IN-LINE (DIL) Reed relay products are available in standard dual-in-line packages for mounting on a printed circuit board or socket. Overall Dimensions Product Series Description Reed Relay, DIL, SPST-NO mm (inch) Vdc Vdc Ohms Vdc A W LxWxH LxWxH Nominal Max. Nominal Max. Max. Max. 5 12 500 12 31 1000 200 0.5 10 Form A 24 46 2150 200 0.5 10 Form B 175 0.25 5 Form C 175 0.25 5 Form C 175 0.25 5 Form C 200 0.5 10 Form A 300 0.5 10 Form A 39.50 (0.768) x 7.22 (0.284) x 5.50 (0.217) 20.14 (0.793) x 7.62 (0.300) x 5.82 (0.229) HE721B0500 Reed Relay, DIL, SPST-NC 39.50 (0.768) x 7.22 (0.284) x 5.50 (0.217) 20.14 (0.793) x 7.62 (0.300) x 5.82 (0.229) HE721B2400 HE721C0500 HE721C1200 Reed Relay, DIL, SPDT-CO 39.50 (0.768) x 7.22 (0.284) x 5.50 (0.217) 20.14 (0.793) x 7.62 (0.300) x 5.82 (0.229) HE721C2400 HE721E0500 HE721E1200 Reed Relay, DIL, SPDT-CO 39.50 (0.768) x 7.22 (0.284) x 5.50 (0.217) 20.14 (0.793) x 7.62 (0.300) x 5.82 (0.229) HE721E2400 HE721R0500 HE721R1200 Reed Relay, DIL, SPDT-CO 39.50 (0.768) x 7.22 (0.284) x 5.50 (0.217) 20.14 (0.793) x 7.62 (0.300) x 5.82 (0.229) HE721R2400 HE722A0500 HE722A1200 Reed Relay, DIL, DPST-NO 39.50 (0.768) x 7.22 (0.284) x 5.50 (0.217) 20.14 (0.793) x 7.62 (0.300) x 5.82 (0.229) HE722A2400 HE751A0500 HE751A1200 HE751A2400 Reed Relay, DIL, SPST-NO, High Voltage Contact Ratings, Switching mm (inch) HE721A2400 HE721B1200 Coil Resistance External Shield Body HE721A0500 HE721A1200 Coil Voltage Transfer Molded Body 39.50 (0.768) x 7.22 (0.284) x 5.50 (0.217) 20.14 (0.793) x 7.62 (0.300) x 5.82 (0.229) 5 6.5 500 12 14 1000 24 28 2150 200 5 14 12 22 500 24 44 2000 200 5 14 12 22 500 24 44 2000 200 5 14 12 22 500 24 44 2000 200 5 12 12 22 500 24 46 2000 5 12 500 12 21 1000 24 46 2150 Contact Form SINGLE-IN-LINE (SIL) Reed relay products are available in standard single-in-line packages for mounting on a printed circuit board or socket. Overall Dimensions Product Series Description Reed Relay, SIL, SPST-NO mm (inch) Vdc Vdc Ohms Vdc A W LxWxH LxWxH Nominal Max. Nominal Max. Max. Max. 5 22 500 12 22 500 200 0.5 10 Form A 24 44 2000 125 175 0.25 5 Form C 300 0.5 10 Form A 24.13 (0.950) x 7.00 (0.276) x 7.40 (0.291) 24.90 (0.980) x 7.60 (0.299) x 7.80 (0.307) HE3321C0500 Reed Relay, SIL, SPDT-CO 24.13 (0.950) x 7.00 (0.276) x 7.40 (0.291) 24.90 (0.980) x 7.60 (0.299) x 7.80 (0.307) HE3321C2400 HE3351A0500 HE3351A1200 HE3351A2400 Reed Relay, SIL, SPST-NO, High Voltage Contact Ratings, Switching mm (inch) HE3321A2400 HE3321C1200 Coil Resistance External Shield Body HE3321A0400 HE3321A1200 Coil Voltage Transfer Molded Body 24.13 (0.950) x 7.00 (0.276) x 7.40 (0.291) 24.90 (0.980) x 7.60 (0.299) x 7.80 (0.307) 5 11 12 22 500 24 44 2000 125 5 14 12 22 500 24 44 2000 Contact Form MINIATURE SINGLE-IN-LINE (SIL) Reed relay products are available in smaller profile single-in-line packages for mounting on a printed circuit board or socket. Overall Dimensions Product Series Description Reed Relay, SIL, SPST-NO HE3671A1200 HE3671A2400 10 Reed Relay, SIL, SPST-NO, Data Switching Contact Ratings, Switching mm (inch) mm (inch) Vdc Vdc Ohms Vdc A W LxWxH LxWxH Nominal Max. Nominal Max. Max. Max. 5 14 500 12 22 1000 200 0.5 10 Form A 24 31 2150 200 0.5 10 Form A 19.05 (0.750) x 5.08 (0.200) x 7.45 (0.293) 19.70 (0.776) x 5.65 (0.222) x 7.87 (0.310) HE3621A2400 HE3671A0500 Coil Resistance External Shield Body HE3621A0500 HE3621A1200 Coil Voltage Transfer Molded Body 19.05 (0.750) x 5.08 (0.200) x 7.45 (0.293) 19.70 (0.776) x 5.65 (0.222) x 7.87 (0.310) Littelfuse electronics product portfolio includes Hamlin 5 14 500 12 22 1000 24 31 2150 Contact Form Magnetic Actuators RECTANGULAR These rectangular bare magnets and packaged actuators are ideally suited for mounting on a flat surface. They are suitable for use in a wide range of environments, including high-temperature applications. Overall Dimensions Recommended Operating Temp. Product Series Description H-31 AlNiCo Magnet 12.70 (0.500) x 1.60 (0.062) x 1.60 (0.062) AlNiCo-5 300 H-32 AlNiCo Magnet 25.40 (1.000) x 4.80 (0.190) x 4.80 (0.190) AlNiCo-5 300 H-33 AlNiCo Magnet 19.10 (0.750) x 3.20 (0.120) x 3.20 (0.120) AlNiCo-5 300 H-34 AlNiCo Magnet 25.40 (1.000) x 6.35 (0.250) x 6.35 (0.250) AlNiCo-5 300 H-40 Neodymium Magnet 7.62 (0.300) x 3.18 (0.125) x 3.18 (0.125) NdFeB 45H 120 H-41 Neodymium Magnet 19.05 (0.750) x 3.18 (0.125) x 3.18 (0.125) NdFeB 35H 120 H-58 Neodymium Magnet 21.00 (0.827) x 7.00 (0.276) x 4.70 (0.185) NdFeB 35H 120 57105 Actuator for Terminal Flange Mount Sensor 40.17 (1.582) x 19.05 (0.750) x 6.35 (0.250) AlNiCo-5 105 57125 Actuator for Pinned Flange Mount Sensor 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) AlNiCo-5 300 57135 Actuator for High-Temp Flange Mount Sensor 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) AlNiCo-5 150 57140 Actuator for Mini Flange Mount Sensor 23.00 (0.906) x 14.00 (0.551) x 6.00 (0.236) AlNiCo-5 105 57141 Actuator for Mini Flange Mount Sensor 23.00 (0.906) x 14.00 (0.551) x 6.00 (0.236) NdFeB 35H 105 57145 Actuator for Flange Mount Sensor 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) AlNiCo-5 105 57150 Actuator for Flange Mount Sensor 28.57 (1.125) x 19.05 (0.750) x 6.35 (0.250) AlNiCo-5 105 57045 Actuator for Mini PCB Mount Overmolded 17.78 (0.700) x 3.30 (0.130) x 4.32 (0.170) AlNiCo-5 105 57050 Actuator for PCB Mount Overmolded 22.86 (0.900) x 4.57 (0.180) x 4.57 (0.180) AlNiCo-5 105 mm (inch) Material ˚C LxWxH Max. CYLINDRICAL Designed for mounting on a frame, these cylindrical bare magnets and packaged actuators are appropriate for use in a wide range of environments, including high-temperature applications. Overall Dimensions Recommended Operating Temp. Product Series Description H-35 Neodymium Magnet 6.35 (0.250) x 6.35 (0.250) NdFeB 35H 120 H-48 Neodymium Magnet 4.40 (0.173) x 6.00 (0.236) NdFeB 35SH 120 CM-1 Ceramic Magnet 12.70 (0.500) x 5.08 (0.200) Ceramic-5 125 H-36 AlNiCo Magnet 4.60 (0.182) x 25.40 (1.000) AlNiCo-5 300 H-315 AlNiCo Magnet 3.00 (0.118) x 15.00 (0.590) AlNiCo-5 300 H-420 AlNiCo Magnet 4.00 (0.157) x 20.0 (0.787) AlNiCo-5 300 H-625 AlNiCo Magnet 6.00 (0.236) x 25.0 (0.984) AlNiCo-5 300 57020 Actuator for Mini Firecracker 5.10 (0.201) x 15.24 (0.600) AlNiCo-5 105 57022 Actuator for Firecracker 5.80 (0.228) x 25.40 (1.000) AlNiCo-5 105 57025 Actuator for Firecracker 6.22 (0.245) x 25.40 (1.000) AlNiCo-5 105 57030 Actuator for Long Firecracker 6.22 (0.245) x 38.10 (1.500) AlNiCo-5 105 mm (inch) Material ØxL ˚C Max. 57060 Actuator for Stainless Threaded Barrel Sensor M8 x 1.25 Pitch x 36.00 (1.420) AlNiCo-5 105 57065 Actuator for Threaded Barrel Sensor (Standard) (5/16 x 24) Pitch x 38.10 (1.500) AlNiCo-5 105 57070 Actuator for Threaded Barrel Sensor (Metric) M8 x 1.25 Pitch x 38.10 (1.500) AlNiCo-5 105 57075 Actuator for Heavy Duty Threaded Barrel M12 x 1.00 Pitch x 46.00 (1.810) Ceramic-2 125 hamlin.com | littelfuse.com 11 Applications Proximity Sensing Using Reed Sensors— Refrigerator Door Features and Benefits: Appliances like refrigerators, freezers and wine coolers are used to keep food/ beverages cold and extend their useful life. These appliances contain lights to illuminate the inside compartments when the doors are open. However, the lights only need to turn on when a door is open. To accomplish this, a proximity sensor is needed to detect if the appliance door is open or closed. • No physical contact required to operate the switch A reed sensor can be used to detect the position of the door. In refrigerators, a reed sensor is mounted to the frame of the appliance and a permanent magnet is mounted to each door. Each reed sensor and magnet pair is positioned so that the reed switch contacts close only when the door is completely closed. The position of the reed sensor’s contacts can be monitored by an electronic control unit (ECU) within the refrigerator’s electronics assembly to turn the interior lights on and off as needed. • Electrical contacts are within a hermetically sealed capsule that is immune to moisture, dust and dirt Reed sensors are ideal for a variety of position- and proximity-sensing applications where there is a need to detect the presence of a moving part in relation to a sensor in a fixed location. LED Light S User Interface • Overmolded sensors provide additional protection against mechanical stresses and vibration • Low-cost alternative to mechanical switch Suggested Products: • FLEX-14 (14 mm reed switch) • 59025 (Firecracker reed sensor) • MDCG-4 (15 mm reed switch) • 59140 (Flange mount reed sensor) • MDSR-10 (10 mm reed switch) Similar Applications: Reed Sensor N Magnet • Zero power required for switch actuation • Wide operating temperature range adequate for use in cold temperatures Frost Sensing Electronic Control Unit Refrigerators/freezers, dish washers, washing machines, rice cookers, coffee makers, vacuum cleaners and vending machines Temp Sensing Ice Dispenser Figure 1-Reed sensors detect the opening of refrigerator doors Proximity Sensing Using Hall Effect Sensors— Garage Door Hall effect sensors can be used to detect the movement of a garage door to stop the motor once the door has reached its open or closed position. Typically, a system of two Hall effect sensors, each associated with its own permanent magnet, is used to determine whether the door is completely open, completely closed or somewhere in between. One of the magnets is mounted on the chain drive of the garage door opener so that it is positioned directly next to the Hall effect sensor used to detect a closed door. The other magnet is positioned so that it moves with the chain and is located directly next to the other Hall effect sensor when the door is completely open. Similar to reed sensors, Hall effect sensors are ideal for position or proximity sensing where there is a need to detect the presence of a moving part in relation to one or more sensors in fixed locations. They offer extended life and reliability over reed sensors since there are no electrical contacts that are opened and closed. Common examples include door- and lid-position sensing in the similar applications listed. Hall Effect Sensor Features and Benefits: • No physical contact required to operate the switch • Wide operating temperature range adequate for use in hot and cold temperatures • Hall effect sensor is an integrated circuit with no mechanical moving components • Encapsulated sensors provide additional protection against environmental/mechanical stresses and vibration • Reliable operation for millions of cycles • Low-cost alternative to mechanical switches or infrared/optical sensors Suggested Products: • 55100 (Miniature flange mount Hall effect sensor) • 55310 (Flat pack digital Hall effect sensor) • 55140 (Flange mount Hall effect sensor) Receiver N S Similar Applications: Electronic Control Board Motor Drive S N Power Supply Figure 2-Garage door, Hall effect sensors mounted above garage door opener 12 Littelfuse electronics product portfolio includes Hamlin Dishwashers, washing machines, vacuum cleaners, security locks on doors and vending machines Speed Sensing Using Reed Sensors— Treadmill Pulley Reed switch-based sensors are used as highly effective speed sensors in low-cyclerate applications with rates up to a few thousand revolutions per minute (RPM). For example, in treadmills, a reed sensor is used to detect the speed of the moving belt. Two permanent magnets are placed on diametrically opposite ends of the belt pulley, and a reed sensor is mounted to the treadmill frame perpendicular to one end of the pulley. As the treadmill pulley rotates, the reed sensor detects when each of the magnets is close to the sensor. The time interval between the detection of each magnet is used to compute the speed at which the pulley is rotating. Reed sensors are highly accurate in speed-sensing applications where there is a rotating part. They are commonly used in fitness equipment where there is a rotating part with a variable speed. Display Board Features and Benefits: • Effective, noncontact solution used to switch the sensor • Low-cost alternative to infrared/ optical sensors • Digital output signal is used to compute speed with high accuracy • Overmolded sensors provide additional protection against mechanical stresses and vibration • Long lifetime and reliable sensing for millions of operations Suggested Products: • 59025 (Firecracker) • 59140 (Miniature flange mount) • 59065 (Threaded barrel) • 59150 (Flange mount) User Interface Similar Applications: Main Motor Board Reed Sensor Motor Drive Fitness equipment, including treadmill, stationary bicycle and elliptical cross-trainer Power Supply Figure 3-Treadmill pulley Speed Sensing Using Hall Effect Sensors— Washing Machine Drum Speed Hall effect sensors make very effective rotary speed sensors. The strengths of these sensors are their reliability, repeatability, accuracy and high speed. For example, in a clothes washing machine, a digital or latching Hall effect sensor can be used to detect a rotating ring magnet to determine the rotating speed of the drum. Multipole magnets (e.g., 8–40 poles) are typically used as the ring magnets in these designs. The frequency and resolution of speed are affected by the number of magnet poles. Direction, as well as speed, can be measured. The direction signal can be provided by either quadrature signaling or with the direction encoded in the pulse width. Quadrature signaling involves two square wave speed signals where the direction of rotation is determined by the lead vs. lag phase relationship between the two signals. Another popular method of detecting speed is to use Hall effect speed sensors to detect rotating ferrous gear teeth such as in an automotive transmission speed sensor application. The Hall effect sensor has a back-bias magnet and detects the variation in magnetic flux density between the gear tooth and the Hall effect sensor. Display Board Flux Concentration-Tooth Position Single Low S Flux Concentration-Valley Position Single High S N N Figure 5-Geartooth sensing Features and Benefits: • Digital output signal is used to compute speed with high accuracy • Effective for high-speed applications • Long lifetime and reliable sensing for millions of operations User Interface Suggested Products: Hall Effect Sensor Main Motor Board Main Motor • 55140 (Flange mount) • 55075 (Geartooth sensor) • 55310 (Flat pack digital) • Custom-designed sensor • 55505 (Geartooth sensor) Power Supply Figure 4-Washing machine drum speed sensor with ring magnet Similar Applications: DC motors, vacuum cleaners and wheel speed hamlin.com | littelfuse.com 13 Applications (continued) Security and Alarm Systems— Door and Window Alarms Many types of security alarm systems use a reed switch/sensor attached to the frame of the door or window. The actuating magnet is attached to the moving door or window so that when it is opened, the reed sensor detects the moving magnet and opens/closes its electrical contacts—sending a signal to the alarm system. Features and Benefits: Similarly, reed switches can easily be mounted to circuit boards used in smoke or gas alarm systems. In portable systems, such as gas detectors, the reed switch is used to activate the system when the handheld detector or reader is placed in the docking station. In systems with smoke/gas detectors in fixed positions, the reed switch can be activated with a handheld magnetic wand to put the detector in test mode. • Zero power required for switch actuation Reed switches and reed sensors are effective solutions for many types of security and alarm sensor applications. Examples include detecting the door and window position, measuring the sump pump water level or activating the test mode of a smoke detector. Reed relays can be used to activate the alarm loop in active sensors like motion sensors and smoke detectors. • No physical contact is required to operate the switch • Wide operating temperature range adequate for use in hot and cold temperatures S N Alarm Driver Reed Sensor • Overmolded sensors provide additional protection against mechanical stresses • Low-cost alternative to mechanical switches Suggested Products: • MDSM-10 (10 mm reed switch) • 59020 (Miniature firecracker) • 59140 (Miniature flange mount) Magnet • Electrical contacts are within a hermetically sealed capsule that is immune to moisture, dust and dirt • 59170 (11 mm overmolded reed switch) • HE3621A0510 (Miniature SIL reed relay) Similar Applications: Burglar systems, smoke alarms and gas detection systems Electronic Control Unit Power Circuit Figure 6-Door alarm system using a reed sensor Continuous Level Sensing— Industrial Tank Water Level Resistive reed ladder networks are used to measure the liquid level in a tank, which allows for a continuous output signal rather than discrete signals from single-point level sensors. This continuous level sensor produces a variable resistance or continuous current/voltage that is related to the position of the float/magnet assembly. As the liquid level changes, the relative float position follows, activating the reeds sequentially and producing the associated output voltage or resistance value. The typical spacing between reed switches is usually provided in 6.35 mm or 12.7 mm steps. Littelfuse supplies full assemblies that include stainless steel or plastic housings. Bare reed switches are also available. Level sensors incorporating reed switch and resistance technology are commonly used for measuring continuous liquid levels in the automotive, marine and industrial markets. The float, which contains a magnet, moves up or down over the sealed stem containing the reed switches/resistors. Features and Benefits: • Continuous level output signal, not like a single-point level sensor • Electrical contacts are within a hermetically sealed capsule that is immune to moisture, dust and dirt • Wide operating temperature range adequate for use in hot and cold temperatures • Sensor housing provides protection against mechanical stresses and vibration Suggested Products: • MDSM-10 (10 mm reed switch) • MDSM-4 (15 mm reed switch) + DC24V • Reliable switching for millions of open/close operations • Custom-designed level sensor assemblies Similar Applications: Load R5 R2 Fluid-level sensing for: urea in diesel trucks, fuel tanks, HVAC refrigerator tanks and condensate water tanks R1 R4 R3 Converter Sensor N N S S Float with Magnet Empty White (Level Signal) Black (Ground) S1 S0 R0 S2 R3 S4 S3 R2 R3 S11 R4 R11 S12 R12 S13 S14 R13 R14 S15 R15 Full S16 R16 Blue (Thermistor Single) Figure 7-Resistive reed ladder network for level sensing 14 Littelfuse electronics product portfolio includes Hamlin Level Sensing— Dishwasher Water Level When provided with a float magnet, reed sensors can function as fluid-level sensors. For example, in a dishwasher, a float-type level sensor is used to detect if the water level inside of the water collection pan has reached the fill limit. The float sensor consists of a reed switch mounted within a shaft and a permanent magnet provided within a float housing. The shaft is vertically mounted within the water collection pan so that the reed switch is positioned at the water fill limit of the pan. As the water level rises, the magnet within the float travels up the shaft to the point where it comes into the proximity of the reed switch. The reed switch senses the presence of the magnet and signals the dishwasher’s ECU that the water level has reached its fill limit. Level sensors incorporating reed switch technology are low-cost solutions for any application where there is a need to detect the amount of liquid in a tank or pan. They are commonly used in white goods and appliances. User Interface Reed Sensor • Zero power required for switch actuation • Electrical contacts are within a hermetically sealed capsule that is immune to moisture, dust and dirt adequate for use in hot and cold temperatures • Sensor housing provides protection against mechanical stresses and vibration • Reliable switching for millions of open/close operations • Wide operating temperature range Suggested Products: • 59630 (Float sensor) • MACD-14 (14 mm reed switch) • FLEX-14 (14 mm reed switch) • 59300 (Level sensor) Similar Applications: ECU Dish washers, washing machines, air conditioners, dehumidifiers and coffee brewers S N Pump Control • No physical contact required to operate the switch • MDSR-10 (10 mm reed switch) Floating Magnet Cold Water Valve Features and Benefits: Hot Water Valve Temp Sensor Figure 8-Float sensor detecting water level in a dishwasher Flow Switch— Tankless Water Heater A flow switch utilizes a reed switch to detect the motion of a valve, paddle wheel or piston that is fitted with a permanent magnet. For example, in some tankless water heater units, the flow sensor contains a permanent magnet that is fixed to a piston that moves when there is water pressure present in the system. As the water pressure increases, the piston movement brings the magnet into the proximity of the reed switch. This causes the reed switch to close and signals the presence of water flow. A flow sensor utilizes a turbine with an attached magnet that rotates by a fixed reed switch or Hall effect sensor. The speed at which the turbine rotates is proportional to the flow rate of the fluid. Reed sensors are highly effective solutions for flow-sensing applications where there is a need to detect the presence of liquid or gas flow in a system. Common uses include water or gas flow in the similar applications listed. User Interface N S • Zero power required for switch actuation • Wide operating temperature range adequate for use in hot and cold temperatures • Electrical contacts are within a hermetically sealed capsule that is immune to moisture, dust and dirt • Overmolded sensors provide additional protection against mechanical stresses • Reliable switching for millions of open/close operations Suggested Products: • MDSM-4 (15 mm reed switch) • MDSR-10 (10 mm reed switch) • MLSM-4 (15 mm reed switch) • 59165 (16 mm overmolded reed switch) • MDCG-4 (15 mm reed switch) • 59170 (11 mm overmolded reed switch) Similar Applications: Water Flow S • No physical contact is required to operate the switch Ignition Circuit Outlet N Features and Benefits: Inlet ECU Dish washers, washing machines, hot tubs and utility gas meters Reed Sensor Power Circuit Figure 9-Flow detection in a tankless water heater hamlin.com | littelfuse.com 15 Beyond Sensing... Littelfuse offers circuit protection… Littelfuse circuit protection products can be used with Hamlin reed switch and sensor products to enhance safety and reliability in various load-switching applications. We recommend using circuit protection for the following examples of load switching: Inductive Load Switching – Arc suppression is recommended to maximize the operating life of inductive loads. For DC loads, a diode should be used. For AC loads, a transient voltage suppression (TVS) diode, a metal oxide varistor (MOV) or a resistor-capacitor (RC) suppression device may be used. MOV and RC suppression devices should not have too much capacitive inrush current as described below. Capacitive Load Switching – Capacitance in the load circuit or long cables may cause permanent or intermittent contact sticking. Contact protection is recommended if the energy stored in the capacitor (E = ½CV2) is greater than 1 µJ. Use a small value resistor in series with the reed switch for contact protection. A BROAD & DEEP PORTFOLIO Littelfuse offers the world’s broadest and deepest portfolio of circuit protection solutions. Our extensive knowledge and experience in circuit protection technologies are accessible to our customers around the globe. If you have a unique circuit protection problem, we have the expertise and resources needed to develop a solution that delivers exceptional safety and reliability. Our global research and development teams are constantly working on innovative circuit protection technologies designed to safeguard the latest products on the market. Fuse Blocks Over-Current Protection • Fuses • Resettable positive temperature coefficient (PTC) devices Fuse Clips Over-Voltage Suppression • Gas discharge tubes (GDTs) • TVS diode arrays • PLED Series open LED protectors • SIDACtor® devices • PulseGuard ESD Suppressors • Switching thyristors ® • TVS diodes • Varistors Fuse Holders Varistors Fuses SIDACtor® Devices TVS Diode Arrays PLED LED Protectors Switching Thyristors 16 LF-Hamline-V23.indd 18 1/28/15 1:49 PM Global Footprint… At Littelfuse, our mission is to develop innovative circuit protection, power control and sensing solutions that meet our customers’ unique needs. This customer-focused philosophy has helped us become the top circuit protection brand in the world. Our industry-leading product portfolio includes reliable circuit protection, power control and sensing products that are designed for a variety of applications. We have assembled unparalleled expertise and developed a global footprint that puts our facilities close to our customers and target markets. As our global manufacturing and R&D teams objectively recommend the best circuit protection, power control or sensing solution for each customer application, they form partnerships that will lead to the development of the next generation of advanced products. Gas Discharge Tubes PulseGuard® ESD Suppressors TVS Diodes Resettable PTC Devices ©2015 Littelfuse, Inc. Specifications, descriptions and illustrative material in this literature are as accurate as known at the time of publication, but are subject to change without notice. Visit www.littelfuse.com for more information. LF-Hamline-V23.indd 19 1/28/15 1:49 PM Littelfuse electronics product portfolio includes: littelfuse.com hamlin.com EC133Nv0115
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