Although it frosts me that you beat me that good one, I'll be a Prince
this time and not say a word.
See you in Anaheim.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: Thursday, January 19, 2006 4:01 PM
To: [log in to unmask]
Subject: Re: [TN] Soldering matte tin over nickel plating
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
The information contained in this electronic message is
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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
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<[log in to unmask]>
; Please respond
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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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