Gold and Tin do not mix in Solder.  In fact, studies done by the
military actually show a degradation in reliability for gold plated
parts that have been soldered into a board.  My guess is that when the
vendor tins the gold leads, the gold evaporates and you would be hard
pressed to find any of it even if you scraped the tin off.  Therefore,
the guidelines that I would follow would be the industry standard on the
thickness of tin plated leads of components

Hope this helps
Max Bernhardt
Woodward Governor Co.

 ----------
From: Rajan, Sanjay
To: technet
Subject: ASSY: Pre-tinning of Gold Leads
Date: Tuesday, January 14, 1997 1:45PM


Technetters

We use a lot of components that come with gold plated
leads (gull wing, J-leaded, castellations..).  We are currently
asking our vendors to pre-tin these leads if possible and one
such vendor wants to know the exact mil-spec that he can
look up to know the thickess of the tinning that is required.

Can anyone point me to the exact document that spits out
recommended tinning thicknesses based on the thickness
of the gold on the lead??

Thank you
________________________________________________
Sanjay Rajan        RF Communications Division
Harris Corporation  Product Design Engineering
1680 University Avenue   Phone:    (716) 242-3923
Rochester, NY 14610 Fax: (716) 242-3174
________________________________________________

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