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August 2019

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Subject:
ENIG PCB Shelf Life
From:
Dave Schaefer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dave Schaefer <[log in to unmask]>
Date:
Tue, 13 Aug 2019 13:45:56 -0500
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Many older postings on this forum and PCB vendor publications regarding ENIG plating suggest this finish has a very long shelf life, in excess of 12 months. However, the somewhat dated IPC-4552 specification I have suggests the shelf life be limited to 6 months.

Can anyone elaborate on what the IPC-4552 recommendations are based upon?
Also, what types of failures would one expect to see with PCBs exceeding the recommended shelf life?

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