Huawei Technologies ME909U-523 LTE Module User Manual English

Huawei Technologies Co.,Ltd LTE Module English

Contents

InstallationInstructions.pdf

Copyright © Huawei Technologies Co., Ltd. 2014.
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Notice
Some features of the product and its accessories described herein rely on the software installed,
capacities and settings of local network, and may not be activated or may be limited by local
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the product or its accessories you purchase.
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Contents
Getting to Know the ME909u-523 ................................................................................................... 1
PCB Design ........................................................................................................................................ 3
Assembly ........................................................................................................................................... 4
1
Thank you for purchasing HUAWEI ME909u-523 LTE LGA
Module (hereinafter referred to as the ME909u-521)
Note:
This manual briefly describes the preparation, the process for PCB Design, Assembly and safety
precautions.
You are recommended to read the manual before using the ME909u-521.
Getting to Know the ME909u-523
The package of the LGA module is 145 pin LGA with a dimension of 30 mm × 30 mm × 2.35
mm. It is applied to the user interface board, and can be used as a wireless terminal in a
network environment.
2
3
PCB Design
PCB Pad Design
To achieve assembly yields and solder joints of high reliability, it is recommended that the PCB
pad size be designed as follows: the sizes of the solder pads on customers' PCBs are the same
as those of the module's solder pads for the high production efficiency and high reliability of
solder joints. For details, see the following figure:
4
Requirements on PCB Layout
The thickness of PCB is more than 1.0 mm (1.2 mm recommended) to reduce the deformation
caused by high temperature welding.
The minimum distance between the LGA module and the PCB edge is 1.5 mm. Other devices
must be located more than 1 mm away from the LGA module (more than 3 mm recommended
if rework is considered).
When the PCB layout is double sided, it is recommended that the LGA module be placed on
the second side for assembly.
Design of Solder Mask
The PCB pad design can be solder mask defined (SMD), or non-solder mask defined
(NSMD).NSMD is recommended. In addition, the solder mask of the NSMD pad design is larger
than the pad so the reliability of the solder joint can be improved.
The solder mask must be 100 µm to150 µm larger than the pad, that is, the single side of the
solder mask must be 50 µm to 75 µm larger than the pad. The specific size depends on the
processing capability of the PCB manufacturer.
Assembly
Stencil Design
It is recommended that the stencil for the LGA module be 0.15 mm in thickness. For the stencil
design, see the following figure：
5
6
Reflow Profile
For the soldering temperature of the LGA module, see the following figure.
Reflow profile
7
Reflow parameters
Temperature Zone Time Key Parameter
Preheat zone (40°C–150°C) 60s–120s Heating rate:
0.5°C/s–2°C/s
Soak zone
(150°C–200°C)
(t1–t2): 60s–120s Heating rate: < 1.0°C/s
Reflow zone (> 217°C) (t3–t4): 30s–90s Peak reflow temperature:
230°C–250°C
Cooling zone Cooling rate: 1°C/s ≤ Slope ≤ 4°C/s

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