David,
Yikes!  Are you seeing suppliers that are trying to pawn off silver finishes too?!  I am NOT referring to immersion silver BOARD FINISHES, which are very thin and have co-deposited organics.
Bev Christian
Research in Motion

-----Original Message-----
From: davidyeh [mailto:[log in to unmask]]
Sent: October 23, 2003 7:41 AM
To: [log in to unmask]
Subject: [TN] Silver finishings


Hi,
 
Can anyone explain the difference between immersion silver finishings in PCB and selective plating used in leadframe?
 
What is the difference between the 2 processes?
 
I am trying to understand why is it that gold wires can be bonded on silver leadframe but does not yield good bond with immersion silver finishings.
 
Does the thickness of the silver plays a part for good bond with gold wires? Does the grain structure play a part too?
 
Thanks for sharing.
 
 
Best regards,
David.
 

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