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According to IPC2221B 9.2.2.3 Tables 9-3 & 9-4 a 4mil laser drilled blind via does not meet Class 3 specs. The minimum size for a buried via is 5.91mils and the minimum blind via is 7.87mils.
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Larry Brophy
Sent: Monday, February 24, 2014 8:19 AM
To: [log in to unmask]
Subject: [DC] Minimum Via size
Is there a minimum via size for a blind via for Class 3?
I'm working on a design that I will need to use a laser drill of 4 mil.
Thanks,
Larry
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