MPC8321E Freescale Semiconductor, Inc, MPC8321E Datasheet - Page 73

• Manufacturer Part Number: MPC8321E
• Description: Mpc8321e Powerquicc Ii Pro Processor
• Manufacturer: Freescale Semiconductor, Inc

Interface material vendors include the following:
23.3
When attaching heat sinks to these devices, an interface material is required. The best method is to use
thermal grease and a spring clip. The spring clip should connect to the printed-circuit board, either to the
board itself, to hooks soldered to the board, or to a plastic stiffener. Avoid attachment forces which would
lift the edge of the package or peel the package from the board. Such peeling forces reduce the solder joint
lifetime of the package. Recommended maximum force on the top of the package is 10 lb (4.5 kg) force.
If an adhesive attachment is planned, the adhesive should be intended for attachment to painted or plastic
surfaces and its performance verified under the application requirements.
23.3.1
When heat sink is used, the junction temperature is determined from a thermocouple inserted at the
interface between the case of the package and the interface material. A clearance slot or hole is normally
required in the heat sink. Minimizing the size of the clearance is important to minimize the change in
thermal performance caused by removing part of the thermal interface to the heat sink. Because of the
experimental difficulties with this technique, many engineers measure the heat sink temperature and then
back calculate the case temperature using a separate measurement of the thermal resistance of the
Freescale Semiconductor
MPC8323E PowerQUICC™ II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 1
Wakefield Engineering
33 Bridge St.
Pelham, NH 03076
Internet: www.wakefield.com
Chomerics, Inc.
77 Dragon Ct.
Woburn, MA 01801
Internet: www.chomerics.com
Dow-Corning Corporation
Dow-Corning Electronic Materials
P.O. Box 994
Midland, MI 48686-0997
Internet: www.dowcorning.com
Shin-Etsu MicroSi, Inc.
10028 S. 51st St.
Phoenix, AZ 85044
Internet: www.microsi.com
The Bergquist Company
18930 West 78th St.
Chanhassen, MN 55317
Internet: www.bergquistcompany.com
Heat Sink Attachment
Experimental Determination of the Junction Temperature with a
Heat Sink
603-635-5102
781-935-4850
800-248-2481
888-642-7674
800-347-4572
Thermal
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