[tinwhiskers] Re: Tin Whiskers elimination article (UNCLASSIFIED)
- From: "Cronk, William CIV USA AMC" <william.c.cronk@xxxxxxxxxxx>
- To: <tinwhiskers@xxxxxxxxxxxxx>
- Date: Tue, 14 Sep 2010 09:49:19 -0400
Classification: UNCLASSIFIED
Caveats: NONE
Bob,
Wish I could help you out being another test subject. I work at a
military base with computer equipment and have only been following the
tinwhisker issue because of expensive equipment that failed where I
found whiskers under an FPGA, and I have had reasons to stay with
tracking the whisker issues.
So even though my experience with designing and building PC boards is
quite extensive, I do a different type of work now.
William C. Cronk
Component Technology Branch
U.S. Army, RDECOM
Night Vision & Electronic Sensors Directorate
RDER-NVG-CT
Fort Belvoir, Virginia
Phone: 703.704.2890 Fax: 703.704.1111
Email: william.c.cronk@xxxxxxxxxxx
-----Original Message-----
From: tinwhiskers-bounce@xxxxxxxxxxxxx
[mailto:tinwhiskers-bounce@xxxxxxxxxxxxx] On Behalf Of Bob Landman
Sent: Friday, September 10, 2010 2:23 PM
To: tinwhiskers@xxxxxxxxxxxxx
Subject: [tinwhiskers] Re: Tin Whiskers elimination article
(UNCLASSIFIED)
Bill,
I can't explain why there's been so little traffic except perhaps people
have become resigned to live with lead-free problems.
I simply could not accept that premise; our products are industrial
rated (-40 to +85C) for use by electric utilities.
With help from Gordon and Denny, we applied a known, very simple, well
proven electroless chemical plating process:
pre-clean the board in water-based solutions DI water rinse soak in 190F
stirred plating solution post-clean the board in DI water dry in hot air
oven
Seems that recently there have been many new product releases claiming
their tin plating doesn't grow whiskers. Perhaps people believe them?
I would remind everyone that their so-called "elimination" is defined
per iNEMI which has a 4000 hours limit with whiskers growing no longer
than 50 microns.
Furthermore, electronic assemblies are made from MANY components, and
they each have a different kind of tin plating. How does one know which
ones won't grow whiskers? No XRF or SEM test will tell you and even if
there was such a test, how do you know each and every part from even a
single vendor that you purchase has the same coating? How long has the
part been in distribution? ICs have lot numbers, resistors,
transistors, capacitors inductors and many other parts do not have lot
numbers.
What we have developed is a metal cap layer applied to ALL components
after assembly that has been proven to stop whiskers from emanating from
tin for FIVE years = 43,800 hours by Drs Kim and Suganuma in the
reference article. There are other scientific articles that also
confirm nickel's ability to stop whiskers.
We are confident that if tin whiskers cannot penetrate a 0.2 micron
nickel coating in 5 years, they won't penetrate the coating in 10, 15 or
20 years.
As our coating thickness is 1 micron in just 5 minutes, we feel the time
is well spent. 5X the proven coating is extra insurance.
We'd love to work with a few organizations like yours if you'd be
interested in evaluating the coating.
You would send us boards to process; we'd send them back and you'd test
them electrically and put them through whatever environmental tests
you'd normally apply to such assemblies.
Regards,
Bob Landman
Managing Partner
LDF Coatings, LLC
rlandman@xxxxxxxxxxxxxxx
President, CTO
H&L Instruments, LLC
www.hlinstruments.com
tel: (603) 964-1818
On Sep 10, 2010, at 5:02 AM, Cronk, William CIV USA AMC wrote:
> Classification: UNCLASSIFIED
> Caveats: NONE
>
> Thanks John for the link. Good job Bob, Gordon, and Denny!
> Congratulations!
>
> So does that explain why there has been little traffic here on the
> tinwhiskers forum?
>
>
>
> William C. Cronk
>
> Component Technology Branch
> U.S. Army, RDECOM
> Night Vision & Electronic Sensors Directorate RDER-NVG-CT Fort
> Belvoir, Virginia
>
> Phone: 703.704.2890 Fax: 703.704.1111
>
> Email: william.c.cronk@xxxxxxxxxxx
>
>
> -----Original Message-----
> From: tinwhiskers-bounce@xxxxxxxxxxxxx
> [mailto:tinwhiskers-bounce@xxxxxxxxxxxxx] On Behalf Of John Burke
> Sent: Thursday, September 09, 2010 1:56 PM
> To: 'TechNet E-Mail Forum'; leadfree@xxxxxxx;
> tinwhiskers@xxxxxxxxxxxxx; RoHSUSAPushback@xxxxxxxxxxxxxxx; 'SMART
Group smart-e-link'
> Subject: [tinwhiskers] Tin Whiskers elimination article
>
> Just an FYI here is my latest article on tin whisker elimination
> published this morning:
>
>
>
> http://www.ems007.com/pages/zone.cgi?a=71147&artpg=1
> <blockedhttp://www.ems007.com/pages/zone.cgi?a=71147&artpg=1>
>
>
>
>
>
> Best regards,
>
>
>
> John
>
>
>
> Classification: UNCLASSIFIED
> Caveats: NONE
>
>
>
>
Classification: UNCLASSIFIED
Caveats: NONE
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