Littelfuse Reed Switches Drt Dth Datasheet
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Axial Lead Reed Switches High Power > DRT-DTH DRT-DTH 39.7mm Standard Changeover Reed Switch RoHS Description The DRT-DTH Reed Switch is a standard changeover switch with a 39.67mm long x 5.33mm diameter (1.562” x 0.210”) glass envelope, with tungsten contacts capable of high voltage and power switching up to 500Vdc at 50W. It has the insulation resistance of 10 9 ohms minimum and contact resistance less than 500 milli-ohms. Features • Changeover switch • Capable of switching 500Vdc or 1.5A at up to 50W Dimensions Benefits Dimensions in mm (inch) 1.83 0.25 (.010) NOM. (.072) NOM. 1.27 5.54 CL OF OVERLAP (.050) DIA. REF. (.218) MAX. 25.40 (1.000) NOM. • Minimum voltage breakdown 1000Vdc • Available sensitivity range 50-80 AT 27.66 (1.89) REF. 12.45 (.490) NOM. 5.33 (.210) MAX. 1.02 (.040) DIA. REF. • Hermetically sealed switch contacts are not affected by and have no effect on their external environment • Can be used as changeover or normally closed contact • Capable of switching European mains voltage • Zero operating power required for contact closure Applications 38.10 - 39.67 (1.500) NOM. - (1.562) MAX. • Industrial safety applications • White goods applications • Security • Limit switching 85.73 - 84.14 (3.375) NOM. - (3.3125) MIN. Switch Type Contact Form C (SPDT-CO) Materials Body: Glass Leads: Tin-plated Ni-Fe wire Note: SPDT-CO = Single-Pole, Double-Throw, Change Over Electrical Ratings Contact Rating 1 W/VA - max. 50 500 350 1000 1.5 1.0 2.0 Carry Vdc - max. Vac - max. Vdc - min. Adc - max. Aac - max. Adc - max. Resistance Contact, Initial Insulation Ω - max. Ω - min. 0.500 109 Capacitance Contact pF - typ. 2.0 Temperature Operating Storage 5 °C °C -20 to +125 -65 to +125 Voltage 3 Current 3 Switching 2 Breakdown 4 Switching 2 6 Notes: 1. Contact rating - Product of the switching voltage and current should never exceed the wattage rating. Contact Littelfuse for additional load/life information. 2. When switching inductive and/or capacitive loads, the effects of transient voltages and/or currents should be considered. Refer to Application Notes AN108A and AN107 for details. 3. Electrical Load Life Expectancy - Contact Littelfuse with voltage, current values along with type of load. 4. Breakdown Voltage - per MIL-STD-202, Method 301. 5. Storage Temperature - Long time exposure at elevated temperature may degrade solderability of the leads. 6. Contact resistance measured at 36Vdc, 100mA, switched wet. 7. Not recommended for small electrical loads. © 2015 Littelfuse Revised: 11/02/15 Specifications are subject to change without notice. littelfuse.com Surface Mount Reed Switches High Power > DRT-DTH DRT-DTH 39.7mm Standard Changeover Reed Switch Product Characteristics Operating Characteristics Operate Time 1 5.5ms - max. Release Time 1 8.0ms - max. Shock 2 Vibration 11ms 1∕2 sine wave 10G - max. 50-2000 Hertz 15G - max. Hz - typ. 2.75kHz - typ. Ampere Turns 50-80 Ampere Turns 60 2 Resonant Frequency Magnetic Characteristics Pull-In Range 3 Rating Sensitivity 4 Test Coil L4988 Notes: 1. Operate (including bounce)/Release Time - per EIA/NARM RS-421-A,diode suppressed coil (Coil II). 2. Shock and Vibration - per EIA/NARM RS-421-A and MIL-STD-202. 3. Pull-In Range - Contact Littelfuse for narrower AT ranges available. 4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value. 5. Custom modifications of forming and/or cutting of reed switches are available. Please contact Littelfuse. Drop-Out vs. Pull-In Chart Part Numbering System DRT-DTH-50-80 70 Max. Min. 60 Series Drop-Out (AT, L4989 Coil) 50 AT Range 50-60 AT 50-65 AT 50-80 AT 65-75 AT 70-75 AT 70-80 AT 75-80 AT 40 30 20 10 Example: 50-80 AT product is DRT-DTH-50-80 Note: These AT values are the before-modification values of the bare reed switch. 0 0 10 20 30 40 50 60 70 80 90 Pull-In (AT, L4989 Coil) Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value. Packaging Packaging Option Packaging Specification Bulk © 2015 Littelfuse Revised: 11/02/15 Specifications are subject to change without notice. Bulk Quantity 1000 Quantity & Packaging Code N/A Taping Width N/A littelfuse.com
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