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March 2004

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Subject:
From:
Doug Corbett <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 18 Mar 2004 15:18:07 -0700
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Technetters,

Do any of you have reliability data or other experience with plugged vias
that are subsequently plated over?

Steve has been kind enough to agree to post pictures of the "defect" on his
website.

The micro section photos of the voids in the plug-and-cap vias. These were
taken at 10X magnification. The voids/bubbles average .005" in diameter,
almost round. Looking at the photos you can determine approximately how
large they are by noting that the drill hole diameter is .010 inches drilled
with a 10-mil drill size.

What potential long-term reliability concerns are there, and is this
considered acceptable for Class 2 product.


Douglas Corbett
L-3 Communications / Communication Systems - West
Senior Manufacturing Engineer - Printed Circuit Boards
(801) 594-3153

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