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February 1999

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Subject:
Solder Mask Clearances on dogbone vias
From:
"Joy, Stephen C" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 17 Feb 1999 16:51:36 -0800
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We are looking at the design rules for soldermask clearances on mini BGAs.
The current rules say the solder mask will be .006" greater than the nominal
hole size.
I have 2 questions.
What is the resolution capability of solder masks? Can solder masks reliably
resolve a .006" line?
What is the current capability for solder mask registration? I would like to
spec nominal FHS+.002"/side as the solder mask opening with no s/m in the
hole.
Thanks,
Steve

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