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Fri, 10 Aug 2007 16:23:15 -0500 |
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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
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Carl VanWormer <[log in to unmask]>
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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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