The simple answer is no. There aren't any "good" reasons to avoid
silver as a surface finish for PCBAs. The longer more knowledgeable
answer is spend 30 days reading every IPC TN posting concerning surface
finishes. Disregard any postings from companies that sell surface
finish chemistries. Make a table with two columns (one pro and one con)
under each surface finish and put an "X" in the appropriate column. At
the end of 30 days your table will give you the answer and that answer
will most likely agree with the simple answer.
Regards,
George
George M. Wenger
Andrew Corporation Wireless Network Solutions
Senior Principal FMA / Reliability Engineer
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 [Office] (732) 309-8964 [Cell]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Carl VanWormer
Sent: Friday, August 10, 2007 5:07 PM
To: [log in to unmask]
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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