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August 2012

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TechNet <[log in to unmask]>
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Date:
Tue, 14 Aug 2012 12:12:21 -0400
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TechNet E-Mail Forum <[log in to unmask]>, "Glidden, Kevin" <[log in to unmask]>
Subject:
PCB finish: ENIG vs. hard gold
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"Glidden, Kevin" <[log in to unmask]>
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Hi everyone,

We have a PCB supplier who is offering "Hard Gold" as an alternate to ENIG finish, due to PCB size and processing capabilities.  The application is Class 3 (mil/aero).  The circuit is thin FR4 and subject to SMT reflow w/ Sn63Pb37 (non RoHS) solder alloy, and moderate flexing in end application.

Can anyone offer info on the differences between the two finishes, and/or their suitability?  Is there an IPC spec (or specs) that outline "hard gold"?

Thanks,

Kevin Glidden


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