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September 2003

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Subject:
From:
Dave Chapman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 5 Sep 2003 06:41:03 -0500
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Well, we have our first 16 mil fine pitch device, 128 pin QFP. I am worried
about printing shorts on a 6 mil stencil. Everything else on the board is 20
mil or better so 5 mil is not good idea. we normally do a 10% reduction and
round the rectangles for better release. The pad width is .7 mil, I would be
pushing 6 mil with the reductions, when our normal rule is on 20 mil pitch
do not reduce overall width to less than 9. If I don't reduce the width I'm
sure we will get shorts.
Am I going to have problems if we leave the width alone and only take the
reduction in volume garnered by rounding the  rectangles?
Dave C.

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