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January 2002

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Subject:
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 15 Jan 2002 17:22:33 EST
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text/plain
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Hi Warren,
You write:
<< The amount of copper thickness provided by the inter layer planes is very
little
compared to the other materials. However it does make for stress risers at
their
intersection with the hole plating. Another place you can see the stress
risers
starting cracks is on the "knee" if the PTH, there is a pad there with plating
flowing over it. >>
A: The problems are not so much that they are 'stress risers', but locations
of maximum loading.

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com

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