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Date: | Thu, 6 Jan 2005 21:07:25 EST |
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Hi Roger,
From what you have told us this far--you have interfacial failures.
If these interfacial failures are on the PCB soldering pad, than ENIG 'black
pad' is a likely candidate.
If these interfacial failures are on the leads, than you have either a lead
material with solderability problems, e.g., Alloy 42, or some metallization
layers on the leads that cause the problem.
Another possiblility is inadequate heat during the solder reflow process
[massive component].
Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com
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