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Thu, 26 Sep 2002 15:14:29 -0400 |
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Hello All-
Just got a call from a good friend in big trouble. He's had a bunch of VERY
expensive BGA assemblies built up with very poor yield. Military
application; designed and built outside. The boards have a 'white tin'
finish and appear to have soldered very poorly. I realize there are many
possible reasons for this, but it sounds like, from their analysis so far,
the board finish is the problem. I don't know how long the boards were on
the shelf before processing, and I won't say where they're from.
What are y'all using for board finish on 0.7 pitch BGA designs? Where do
you get your bareboards? What are the pros and cons of white tin vs.
nickel/gold?
Thanks in advance for your responses,
-Chris
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