RE: [SI-LIST] : Heat sink and radiated emissions

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From: George_Tang@Dell.com
Date: Wed Jul 26 2000 - 18:54:02 PDT


I have seen EMI problems caused by aluminum heat sinks when they are not
grounded. But the problem can become much worse if they are incorrectly
grounded. Identify the current loops and keep them small. I have tried
plastic heat sinks molded with metal particles to give better heat
conduction. Above 1.5 GHz, the plastic heat sink radiated as well as its
metal counter part. Ceramic heat sinks might work well for you depending on
your applications.

Regards,

George Tang

-----Original Message-----
From: Wayne Gibson [mailto:wayne.gibson@alcatel.com]
Sent: Tuesday, July 25, 2000 1:18 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Heat sink and radiated emissions

Hello,

I have an EMC oriented question. Currently, investigating the use of
aluminum, ceramic and enhanced plastic heat sinks for possible use on a
TBPA package. Does anyone have information regarding different heat
sink material with respect to radiated emission levels? As well as heat
dissipation for different material.

Thank you,

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