Franklin,
I suspect a 'misspelling' or 'mistake'.  They may have meant Ni but put
down Sn, or maybe Sn/Ni (that is the tin-nickel alloy used in the Bay Area
in the 70's).  50 uinch of Au would make this tin-rich solder joint very
unreliable as well as expensive.

Happy Holden
Westwood Associates




Franklin Asbell <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
01/05/2006 01:57 PM
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Subject
[TN] Gold over Tin






Received an unusual request for quote with a fab note callout for the
following.



1.      Plate 200/50 microinches SnAu (very hard)





Now I read that as 200 microinches of tin plating, followed by 50
microinches of Gold and thought to myself..huhhhh!!!



I contacted the buyer and he agreed it was quite unusual but they indeed
need gold over tin. The buyer could not explain why, so I thought I would
see if others have performed this process, and why such uncommonly mixed
coatings???



Franklin








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