Avnet COM Express MSC C6B-SLH User manual

Heat spreader mounting instructions
COM ExpressTM Basic Module
MSC C6B-SLH, MSC C6B-KLH
MSC C6B-CFLH, MSC C6B-CFLR
Rev. 0.5 2020-04-28

MSC C6B-SLH / KLH / CFLH / CFLR Heat spreader mounting instructions
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Preface
Copyright Notice
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Copying of this document, and giving it to others and the use or communication of the contents
thereof, is forbidden without express authority. Offenders are liable to the payment of damages.
All rights are reserved in the event of the grant of a patent or the registration of a utility model or
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This documentation is intended for qualified audience only. The product described herein is not
an end user product. It was developed and manufactured for further processing by trained
personnel.
Disclaimer
Although this document has been generated with the utmost care no warranty or liability for
correctness or suitability for any particular purpose is implied. The information in this document
is provided “as is” and is subject to change without notice.
EMC Rules
This unit has to be installed in a shielded housing. If not installed in a properly shielded
enclosure, and used in accordance with the instruction manual, this product may cause radio
interference in which case the user may be required to take adequate measures at his or her
owns expense.
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If the information provided there does not solve your problem, please contact our Technical
Support: Email: [e-mail]
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MSC C6B-SLH / KLH / CFLH / CFLR Heat spreader mounting instructions
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1 Introduction
This document is designed to give the customer a better understanding of important considerations, when
using MSC heat spreaders on the MSC C6B-SLH, MSC C6B-KLH, MSC C6B-CFLH or MSC C6B-CFLR
module. Below you will find important guidelines that must be followed to ensure that the heat spreader is
properly mounted.
1.1 General Information
Modern computers use very dense chip architectures that create a lot of heat in a relatively small area. To
make sure that the parts are used within their specifications, it is necessary to provide a method to
conduct the thermal energy away from the sensitive semiconductor dies. For this purpose MSC offers
different cooling solutions, a heat spreader and a heat spreader.
Note: This heat-spreader by itself does not constitute the complete thermal solution for a COM Express
Module, but provides a common interface between modules and implementation-specific thermal
solutions.
2 Mounting Instructions
Photo 1 shows the heat spreader bottom side. It is delivered in a blister packaging together with some
screws that are used to fix the heat spreader onto the C6B-SLH/KLH/CFLH/CFLR module. The frame
shows the thermal contact locations of the heat spreader. According to the amount of heat, that has to be
transferred, different materials have to be chosen to achieve optimal thermal contact. The grey pad
consists of a phase change material that melts the first time it is heated. Due to the mechanical pressure
between die and heat spreader, the residual material is pressed out of the gap; thus leaving behind only a
very thin film with a very good thermal performance. Since this pad is printed on the aluminium, it is very
soft and sensitive to scratches. If you happen to damage the surface of the pad, use a clean knife or
something similar and try to reshape it so that the die surfaces are completely covered.
The blue pad under the smaller ALU block is designed not only to conduct the heat but also to
compensate for mechanical tolerances between chipset and heat spreader.
Photo 1: Heat spreader bottom side

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Step 1: Insert the memory module into the top memory socket. Make sure it is inserted correctly!
Note: When using only one memory module, insert it into the socket on the topside of the module.
Step 2: Place the printed circuit board onto the heat spreader and fix it by tightening the four screws in
the sequence 1 to 4 as shown below.
NOTE: The recommended screw tightening torque with a PH1 screwdriver is 0.4 Nm.
Step 3: Insert the memory module into the bottom memory socket if necessary.
Step 4: Mount the MSC C6B-SLH/KLH/CFLH/CFLR module on the baseboard and fix it securely with
adequate screws through the five mounting holes as defined in the COM Express Module Base
Specification. Please note that these screws are not provided in the delivery because there are different
mechanical implementation options like stacking height of COM Express receptacles on the customers’
carrier board.
There are two versions of heat spreaders in order to satisfy different mounting options needs, when
assembling module, heat spreader and baseboard.
On the C6B-SLH-01 HSP the five intended standoffs incorporate 2.7 mm though holes for screwing
through the top side of the heat spreader. On the C6B-SLH-02 HSP these standoffs incorporate M2.5
threads form screwing though the bottom side of the baseboard.
NOTE: The recommended screw tightening torque with a PH1 screwdriver is 0.4 Nm. It is also
recommended to use the full thread depth inside the standoffs (11mm).
NOTE:
The grey heat conducting pad is phase change material and intended for one-time mounting only. If you
need to remove the heat spreader for service purposes and want to reuse it, the wax-like material must
be spread over the full die surface before re-mounting the heat spreader (see above, paragraph 2).