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January 2006

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Subject:
From:
"Douglas O. Pauls" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Thu, 19 Jan 2006 17:01:14 -0600
Content-Type:
text/plain
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Yes, I am happy to report the SnO2 White consideration dwarfs the others,
however Grumpy that makes people.
Beetcha to it Dewey

Doug Pauls




             Leo Higgins
             <Leo_Higgins@ASAT
             .COM>                                                      To
             Sent by: TechNet          [log in to unmask]
             <[log in to unmask]>                                          cc

                                                                   Subject
             01/19/2006 04:45          Re: [TN] Soldering matte tin over
             PM                        nickel plating


             Please respond to
              TechNet E-Mail
                   Forum
             <[log in to unmask]>
             ; Please respond
                    to
                Leo Higgins
             <Leo_Higgins@ASAT
                   .COM>






Agree with Dave.  Matte tin should look dull silver-gray.  SnO2 is white.
I
have seen  matte tin get quite white if the parts have been stored a "long"
time allowing the units to get oxidized.


Best regards,
Leo

Leo M. Higgins III, Ph.D.
Vice President, Technical Support Operations
ASAT, Inc.
3755 Capital of Texas Highway, Suite 100
Austin, Texas     78704

office phone   512-383-4593
mobile           512-423-2002
[log in to unmask]
www.asat.com


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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of David D. Hillman
Sent: Thursday, January 19, 2006 4:30 PM
To: [log in to unmask]
Subject: Re: [TN] Soldering matte tin over nickel plating


Hi John! A white deposit on a matte tin finish can not be a good thing and
is not normal for the matte tin finishes I am familiar with. I would
subject the components to the JSTD-002B Test S (Surface Mount Simulation
test) to see if it passes. If it fails then you have leverage with your
vendor based on data and not observation. Good Luck.

Dave Hillman
Rockwell Collins
[log in to unmask]




             John Burris
             <johnhburris@GMAI
             L.COM>                                                     To
             Sent by: TechNet          [log in to unmask]
             <[log in to unmask]>                                          cc

                                                                   Subject
             01/19/2006 08:54          [TN] Soldering matte tin over
             AM                        nickel plating


             Please respond to
              TechNet E-Mail
                   Forum
             <[log in to unmask]>
             ; Please respond
                    to
                John Burris
             <johnhburris@GMAI
                  L.COM>






Dear TechNetters,

We are just starting our journey into lead-free (we are currently covered
under Article 9, but we can see the handwriting on the wall), and we are
starting to deal with some issues as suppliers are making component changes
to comply with RoHS. The component at issue is a heat sink for a TO-220
transistor. Flux is 2% no-clean. Solderability is not good; partial solder
adhesion (about 20-30%) on the mounting tabs. 90% coverage is required by
standards.  The matte tin finish appears to have a white deposit that can
be
removed by either scraping or cleaning with a mild solvent. Vendor says
this
is normal and should not affect solderability.

Thoughts?

John Burris

Automated Logic

1150 Roberts Blvd.

Kennesaw, GA 30144-3618

01.770.795.4827 (Office)

01.770.795.3527 (Facimile)

01.404.431.9109 (Cellular)




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