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November 1997

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TechNet <[log in to unmask]>
Subject:
Re: ASSY: SMT/Temp. Cycling Test Failures revisited
From:
Jim Marsico 516-595-5879 <[log in to unmask]>
Date:
Tue, 4 Nov 1997 07:49:00 -0400
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"TechNet Mail Forum." <[log in to unmask]>, Jim Marsico 516-595-5879 <[log in to unmask]>
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You didn't mention if your failures were opens or shorts.  If you think that
moisture is causing bridging, I'm assuming shorts.  Can't help much there, but
we did experience cracking of glass diodes when the conformal coating was too
heavy on these components... TCE mismatch and all that.

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