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April 2007

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Subject:
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 27 Apr 2007 15:49:29 EDT
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Hi Frank,
Your approach is almost identical to what I suggest in my White Paper:
"Recommendations for PCB FAB Notes and Specifications in Printed Circuit Board
Drawings for SnPb and Lead-Free Soldering Assemblies, the Qualification of PCB
Shops and Activities to Assure Continued Quality."
For 'Drilled Hole Size' the drill diameters are specified at 30 mils and
below and given a refderence values above that; the 'Finished Hole Size' is given
as a reference for the smaller holes and specified with a =/- 0.003 mils
tolerance for the larger holes.
For all holes a minimum copper plating thickness is mandated.

Werner



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