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Date: | Fri, 27 Apr 2007 10:05:15 -0400 |
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I don't disagree but, unless I'm behind the times which is entirely
possible, the IPC used to promote the practice of specifying all plated
hole sizes as finished permitting the manufacturer to select the
appropriate drill. I'm not implying this is the best practice, but on
the other hand I've not seen a via reliability issue attributable to the
finished via hole tolerance on the drawing.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier
Sent: Thursday, April 26, 2007 3:23 PM
To: [log in to unmask]
Subject: Re: [TN] "plated shut vias"
Hi All,
Vias should never be specified in terms of finished hole size (there is
no
functional need for any specific finished hole diameter), but in terms
of
drilled hile diameter, because that determines all kinds of things
important to the reliability of the via interconnect structure.
Werner
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