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February 2008

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TechNet E-Mail Forum <[log in to unmask]>, Hfjord <[log in to unmask]>
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Thu, 7 Feb 2008 17:46:00 +0100
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Genny ,

What are you seeing that creeps along the legs: SAC, Ag or Tin? If pure
Silver wets as far as to the contact area, I would be scared, because of the
migration risk. I can't see how it could be pure Silver, but I want to know.
I have seen too many times what humidity, Silver and voltage difference can
cause!

A penny for Genny

Inge

-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Genny Gibbard
Skickat: den 6 februari 2008 21:43
Till: [log in to unmask]
Ämne: [TN] SAC on gold pins

So,...
During assembly, say that you see SAC solder wicking up the pins of a
finepitch surface mount header onto the contact area which is
gold-plated.  The gold-plated header normally mates with gold socket
connector.  
What would be the reliability issues with SAC solder in contact with the
gold socket?  Does the silver in the solder mitigate any of the
tin-to-gold issues I have been reading about?

Genny

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