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February 2004

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Subject:
From:
"Whittaker, Dewey (AZ75)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 13 Feb 2004 06:40:09 -0700
Content-Type:
text/plain
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text/plain (84 lines)
Scott,
Welcome to the real world.Even if you thought you had control over the final
lead finish,you have been or will continue to receive parts with a 100% tin
finish.COTS initiatives,out-sourcing,globalization strategies and failures
of notification will result in these parts entering your system.
If you understand the end use and nature of your product,there are many risk
mitigating scenarious which should allow you to still manufacture a product
to meet your current requirements.
Dewey

> -----Original Message-----
> From: Newland, Scott [SMTP:[log in to unmask]]
> Sent: Friday, February 13, 2004 6:05 AM
> To:   [log in to unmask]
> Subject:      [TN] Pure Tin Component Finish
>
> During our resent lead free evaluation it was discovered that several of
> our
> component vendors are changing their finishes from tin- lead to pure tin.
> Quite
> often this change is being made with no part number change, so these part
> are
> getting to our manufacturing floor without anyone knowing they have a
> different
> finish.  This has lots of people's attention due to the Hi Rel nature of
> most of
> our products.  We have narrowed our concerns to two:  tin whiskers and
> solder
> joint reliability.  There is a lot of work being performed on tin
> whiskers.  Do
> you see the pure tin component finish impacting the tin- lead solder joint
> metallurgy to the point of impacting high or low cycle fatigue??  Typical
> I
> would think the component finish would be a small percentage of the total
> volume
> of the solder joint, resulting in minimal impact.  But I'm afraid the
> inter-metallic layers maybe impacted, resulting in changed reliability.
>
> The opinions of this group would be valued.
>
>
> Scott Newland
> Harris GSCD
> 321 727 6472
> Pager  321 690 4131
> E-Mail  <mailto:[log in to unmask]> [log in to unmask]
> For a brain teaser try:
>  <http://pao.gsfc.nasa.gov/science.html>
> http://pao.gsfc.nasa.gov/science.html
>
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