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August 2003

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Subject:
From:
Reuven ROKAH <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Sun, 31 Aug 2003 13:16:04 +0300
Content-Type:
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text/plain (148 lines)
There is any written std. / spec. for immersion Silver?

Thickness, appearance, handling procedure, packaging, inspection
instructions, solderability, tolerance's etc.???


Best Regards





                      Dave Chapman
                      <dchapman@CIRCUITS To: [log in to unmask]
                      ERVICE.COM> cc:
                      Sent by: TechNet Subject: Re: [TN] Immersion Silver vs. White Tin
                      <[log in to unmask]>


                      28/08/2003 19:53
                      Please respond to
                      "TechNet E-Mail
                      Forum."; Please
                      respond to Dave
                      Chapman





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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