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March 1997

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Subject:
Re: ASSY: Fractured Solder Joints
From:
[log in to unmask]
Date:
Fri, 28 Mar 1997 10:14:15 -0500 (EST)
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Hi Steve, 
Your fractures are caused by the thermal expansion of the resin surrounding
your PTHs which are stretching your PTH Cu barrels by over 10%. The presence
of Au certainly does not help matters either. What is the point of the10
thermal cycles of 54 Deg. C <-> +95 Deg. C; that is like driving a car into a
stone wall before selling it to the customer.

Werner Engelmaier
Engelmaier Associates, Inc.
Electronic Packaging, Interconnection and Reliability Consulting
23 Gunther Street
Mendham, NJ  07945  USA
Phone & Fax: 201-543-2747
E-mail: [log in to unmask] 

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