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November 2002

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Subject:
From:
Bill Decray <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 7 Nov 2002 07:56:01 -0500
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Don't you have to use Tegon with the Thermalbond to bond it to the material?



William W. DeCray III
Engineering Services Manager
PHONE:(434) 237-6391 ext 115
CELL:   (434) 851-6115
FAX:    (434) 237-1324
E-mail:<[log in to unmask]>
Web http://www.waytec.com
FTP  ftp://ftp.waytec.com


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Newland, Scott
Sent: Thursday, November 07, 2002 7:41 AM
To: [log in to unmask]
Subject: Re: [TN] heatsinking a PCB


Try Arlon - Thermalbond.  It is a rubber based thermally enhanced compliant
sheet adhesive.  It comes in .015 and .008 thinknesses.  You will still need
to
add the electrically conductive gaskets to get electrical conductivity.  We
typically use a vacuum bag to perform the lamination processes.  We have
used
this material in several space and airborne applications with great success.

Scott Newland
Harris GSCD
321 727 6472
Pager  321 690 4131
E-Mail  <mailto:[log in to unmask]> [log in to unmask]
For a brain teaser try:
http://pao.gsfc.nasa.gov/science.html
<http://pao.gsfc.nasa.gov/science.html>


-----Original Message-----
From: Genny Gibbard [mailto:[log in to unmask]]
Sent: Wednesday, November 06, 2002 10:53 AM
Subject: heatsinking a PCB

We have a small PCB with SM components mounted on one side and a heatsink
mounted against the other side over the entire surface of the PCB.  The
heatsink
is grounded, so we use a thermally conductive, electrically isolative
thermal
interface material in between (0.5mm thick), to protect signal vias.  We
also
use some strips of electrically conductive gasket in strategic areas to
provide
good electrical grounding between the two.
Migration of some substances out of the thermal material onto the PCB over
time
has caused performance problems on random, not all, units.

I was wondering what other methods might exist for heatsinking a PCB,
possibly
permanently bonding the metal heatsink to the PCB in some way.  Any sources
of
information for alternatives is appreciated.  We cannot change the
construction
materials of the original PCB, which is a multilayer (4 layer) FR4, but we
may
be able to bond an additional layer onto the PCB, in place of the gasketing
we
use now.

Thanks in advance,
Genny
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