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October 2002

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Subject:
Re: Back to back BGAs
From:
Dave Hicks <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Wed, 30 Oct 2002 16:59:10 -0500
Content-Type:
text/plain
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text/plain (24 lines) 
Ray,
What is the temporary mask that you use at the corners of the BGA to hold it
in place.  Is it Kapton tape?

Ray wrote in part:
"Depending on the weight of the devices, you may need
to use a temporary mask at the corners of the BGA to mechanically hold the
BGA's in place. We had 16 SBGA's (8 per side). Due to the weight of these
parts (heat spreader on the package), that's what we had to do. Failure to
do this could create elongated solder joints or open solder connections.
Depends on the weight of the device."
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