Hi Carl - Rockwell Collins has been utilizing immersion silver as a pwb 
surface finish for over 10 years in a wide variety of avionics use 
environments. All pwb surface finishes have specific conditions and use 
environments that they will not work in but the generalization on the 
applicability of immersion silver provided by your management is 
incorrect.


Dave Hillman
Rockwell Collins
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Carl VanWormer <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
08/10/2007 04:07 PM
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Subject
[TN] Silver PCB finish and reliability (question)






For non-BGA, surface mount boards, we have always ordered HASL boards.  In 
our progress towards ROHS compliance, management has changed the default 
specification to ENIG.  Our board house has HASL, ENIG, and Silver as 
options, with Silver at about the same price as HASL and ENIG with a 
significant premium (along with a 2 to 3 days added to the processing 
time).  When I asked management why we couldn't use Silver, I was told 
that there are significant problems with the Silver processed boards (with 
no real explanation). 

My question to the Group:  Is there any good reason to avoid Silver as a 
surface finish on my consumer and industrial boards? 

Your scary stories are welcomed . . .

Thanks,
Carl





Carl Van Wormer
Cipher Systems
1800 NW 169th Place, Suite B-100
Beaverton, OR  97006
Phone (503)-617-7447 extension 20 




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