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Date: | Wed, 7 Apr 1999 07:30:15 EDT |
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Hi Ed,
You do not say how large the LCCCs are nor on what substrate they are
mounted.
However, with this much Au in a vibratory environment one does not even have
to consider cyclic thermal expansion mismatches—these assemblies are in
trouble.
Some standard MIL vibration testing should give you a good indication and
convince management. That way you do not have to perform the more
resource-intensive thermal cycling.
The various Mantech studies (Martin-Marietta, early 1990's; etc.) should also
give you good information just on LCCCs on polymeric substrates.
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]
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