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October 2011

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Subject:
From:
Fabien Guizelin <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Fabien Guizelin <[log in to unmask]>
Date:
Tue, 18 Oct 2011 00:39:22 +0000
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Hi all,
I am facing a PWA failure at low temperature.  An EDX analysis revealed a P-content of 10.4%wt which is outside the IPC-4552 1.2.1 specifications (7-10%).   The PCB has an ENIG finish.
Could I be facing black-pad ?
How severe is the 0.4%wt additional Phosphorous content ?
Regards,
Fabien


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