Hi John!

We are building several assemblies that have BGA's with heatsinks and
they come with a double-sided tape that we peel a coversheet off and
then attach them to the BGA's. The tape has a metal mesh integral to it
that transfers the heat from the BGA to the heatsink. Double-sided tapes
are what I see the most. They're convenient to deal with from an
assembly point of view. The company that we buy the heatsinks from is:

http://www.cofan-usa.com/index.php

But I have seen other methods as well. A good web page to see the
different methods to consider is at:

http://www.thermaflo.com/attach.shtml

Another good web page is at:

http://www.aavidthermalloy.com/products/heatsinks.shtml

When you get to that page there's a menu box titled "Products" that will
give you a listing by device, product line, attachment methods, etc..


-Steve Gregory-





-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Foster
Sent: Monday, May 21, 2007 4:42 PM
To: [log in to unmask]
Subject: [TN] chip heatsinks

We are using some BGA's that are going to run very hot.
What is the best way to attach heatsinks to these devices?

Any help will be appreciated 

Thanks
John Foster

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