Just out of curiosity, does the immersion silver effect long term
reliability of tin-lead solder joints?
Jim Marsico
Senior Engineer
Production Engineering
EDO Electronics Systems Group
[log in to unmask] <mailto:[log in to unmask]>
631-595-5879
-----Original Message-----
From: Dave Chapman [SMTP:[log in to unmask]]
Sent: Thursday, August 28, 2003 12:53 PM
To: [log in to unmask]
Subject: Re: [TN] Immersion Silver vs. White Tin
Agreed, Immersion Silver was a drop in replacement both at reflow
and wave.
Silver was lower cost or same as HASL. Only caution, the joints do
look
different than HASL boards so education rather than rejection is the
word of
the day.
As with all alternate finish boards handling is important, hands off
the
board, slip sheets needed on only the top and bottom boards since
the
finish is actually below the surface of the solder mask so no big
risk of
scratching) in vacuum sealed bags, remove from packaging just before
processing, don't let sit on the shelf unless fully processed, don't
wait
3-4 weeks to run through the wave after SMT because you may see
tarnish,
although solderability is still good, statistically the sooner
processed the
better.
White Tin we had to go to higher temp profile and watch every step.
Congratulations on going to Lead Free PCB's
Dave Chapman
-----Original Message-----
From: Bill DeCray [mailto:[log in to unmask]]
Sent: Thursday, August 28, 2003 11:34 AM
To: [log in to unmask]
Subject: Re: [TN] Immersion Silver vs. White Tin
Immersion silver would be the best choice
Highest Regards
William W. DeCray III
Sales Engineering Manager
Waytec Electronics Corp.
Phone: (434) 237-6391 Ext 115
Fax: (434) 237-1324
Cell: (434) 851-6115
E-mail [log in to unmask]
Website www.waytec.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Thursday, August 28, 2003 11:31 AM
To: [log in to unmask]
Subject: [TN] Immersion Silver vs. White Tin
Hi All!
Got a customer that's calling out on the fab drawing, either
Immersion
Silver
or White Tin for a board finish.
Me, not having great deal of experience with either one (yet), am
wondering
if I had to choose, which one would I choose?
Have any of you worked with both, and have a preference of one over
the
other? Why?
As always, thanks in advance!
-Steve Gregory-
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