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January 2003

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Subject:
From:
Rick Thompson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 27 Jan 2003 10:58:00 -0800
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Can someone tell me what the difference is between immersion gold and flash
gold as a board finish?  Is the 'flash' process a different type of plating
process?  Also, has anyone had any experience using Lead-free solder paste
on a Flash gold finish?  We're currently having some solder wetting issues
with lead-free on flash gold where some of the pads on the boards exhibit
complete lack of any wetting.  It almost looks like what you get when you
reflow solder paste on a ceramic substrate, where the solder just balls up.
Is this an inherent problem with flash gold or do I have some kind of
abnormal processing issue at the board vendor?

Thanks in advance.

Rick Thompson

Sr. SMT Process Engineer
SMTEK International, Inc.
+1 (805) 532-2800
[log in to unmask]

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