Thanks!

You surprised me by giving me a link to MY OWN WEB SITE!
I put that article there a long time ago and forgot about it.
You are probably the only person in the world who still had it.

Anyway, thanks to all who responded. We have a design here
with nine D2PAKs that are completely enclosed in a sand casting.
Therefore, we want to get the heat away from them (through the PCB)
and into the casting.

Someone recommended a ceramic material which I think has a
thermal conductivity of about .7? (FR4 is about .3? I think) but it
looks like there are several materials that can beat that. Seems
like ceramic would be expensive anyway for what you would get
from a thermal point of view. Am I missing something?

Now you people have given me so many choices I don't know
WHAT to pick!

thanks again,
Jack





"Brooks,Bill" <[log in to unmask]>
28Jan2002 10:33 AM


To:   "'(Designers Council Forum)'" <[log in to unmask]>
      "'Jack C. Olson'" <[log in to unmask]>
cc:

Subject:  RE: [DC] Material Properties
Retain Until: 02/27/2002 Retention Category: G90 - Information and Reports
Caterpillar Confidential:  Green


here are a couple of links to thermal references... hope this helps...
- Bill Brooks

http://www.irf.com/technical-info/an994/an-994.htm

http://www.geocities.com/Heartland/Hills/5131/thermal.htm


-----Original Message-----
From: Jack C. Olson [mailto:[log in to unmask]]
Sent: Monday, January 28, 2002 6:06 AM
To: [log in to unmask]
Subject: [DC] Material Properties


Ok, is it just Monday morning, or am I looking in the wrong direction?

I am trying to find the thermal conductivity of different materials, but
nothing in the IPC-4101 looks like what I need.
Is it in there somewhere?

I'm not interested in the thermal stability (today, anyway), just the
conductivity in the Z direction. I need something better than FR4.

Does anyone have any good material property tables?

Jack

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