Huawei MC509 Hardware Manual page 50

HUAWEI MC509 CDMA Mini PCIe Module
Hardware Guide
On the customer PCB, reserve two metal screw holes, which are connected to

the PCB ground plane. When installing the Mini PCIe, use two metal screws to
fasten the Mini PCIe to the customer PCB. See the following figure.
Ensure that the air flow around the Mini PCIe is sufficient.

Try not to place any component in the Mini PCIe's projection region on the

customer PCB. Do not place components with 1.5 W or higher power
consumption or heat sensitive components (such as crystals) near the Mini PCIe.
Use a large customer PCB. The recommended size (W x D) is 70 mm x 70 mm

(3.15 in. x 3.15 in.).
If the thermal conductive material is attached between the Mini PCIe and the

customer PCB, then the heat dissipation performance will be better for multilayer
PCB.
Apply copper to the region for attaching the thermal conductive material to the

customer PCB. Try to use the continuous ground plane design on the customer
PCB, and each ground plane must be connected through holes. Therefore,
reserve holes as many as possible.
If you do not take the preceding heat dissipation measures, the overheat protection mechanism
is triggered due to overheated Mini PCIe and the network connection is terminated when the
Mini PCIe keeps working in enclosed space with a 70
condition for a period of time. You can resume the network connection only after the
temperature drops.
Issue 03 (2014-12-26)
Thermal Conductive Material
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Thermal Conductive Material
Screw
Mini PCIe
ºC
temperature and the Max. power
Mechanical Specifications
Mini PCIe
Customer PCB
Customer PCB
50