6 of one, 1/2 dozen of the other.
You should consider many factors in regards to which is preferable, for
example, shelf-life, handling, packaging, number of thermal cycles the
product will see, surface features, size/pitch, etc.
In my opinion, handling durability is better with immersion tin; shelf life
is better with immersion tin, and solderability are equal when measuring the
same feature types.
This is comparing the Omikron with the Macdermid Sterling Silver, and, most
important, both baths operating optimal.
The Omikron bath is more difficult to maintain than the MacDermid SS but if
I had to choose one over the other it would still be the Omikron. The
thickness of the Omikron needs to be on the high side (30 - 40 micro") in
order to pass multiple thermal cycles, I've not seen silver pass as many
with similar results as tin.
Again, there are many factors you should consider, keep asking questions,
talk to suppliers, customers, run DOE's, get your hands dirty and you will
find what suits you best, this is just my opinion.
Franklin
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of kwood716
Sent: Monday, September 25, 2006 4:25 PM
To: [log in to unmask]
Subject: [TN] PCB Finish
Hey all,
Question...
Is immersion silver a more reliable and all around better finish than white
tin? I am looking into using it instead of the Omikron OA-8 we currently use
and would like some input.
Note: I can't use and nickel in the PCB, these boards are for MRI use and
have to be completely non-magnetic.
Thank you
Ken
_____
Saturn PCB Design, Inc.
Kenneth J. Wood CID
2737 Bishop Lane
Deltona, Fl 32725
Phone: 407-340-2668
email: <mailto:[log in to unmask]> [log in to unmask] www.saturnpcb.com
<http://www.saturnpcb.com/>
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