Hi Terry - ok, before you send everyone into cardiac arrest, let's provide
the complete response. The tin whiskers found on SAC solder joints have
been associated with significant levels of ionic contaminates. The
Celestica/BAE paper is a SERDP funding project looking at the role of
ionics and tin whiskers. More data will be published in FY12 on this
data. The report Terry listed was a paper in the 2011 SMTA/IPC Cleaning
and Coating conference proceedings.
Dave Hillman
Rockwell Collins
[log in to unmask]
Terry Munson <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
10/29/2011 09:10 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Terry Munson <[log in to unmask]>
To
<[log in to unmask]>
cc
Subject
Re: [TN] Whiskers from Immersion Tin Finish?
We have found whiskers from the sac 405 and 305 solders. And Celestica
published a paper on there experiments last year showing whiskers on
solder joints as well.
Terry Munson
Foresite
765-457-8095
On Oct 28, 2011, at 4:52 PM, Joyce Koo <[log in to unmask]> wrote:
> It depends....
>
http://www.atotech.com/data/publications/pcb/Immersion_Tin-Kinetics_of_Whisker_growth.pdf
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
> Sent: Friday, October 28, 2011 4:19 PM
> To: [log in to unmask]
> Subject: [TN] Whiskers from Immersion Tin Finish?
>
> I've always been under the impression that the risk of Tin Whiskers was
> mostly from the portion of component leads that don't get wetted with
> solder. (for example, a right-angle through hole connector may have
exposed
> leads ABOVE the solder joint area)
>
> Now I'm being asked about the risk of whiskers from Immersion Tin finish
in
> areas that don't get soldered, like vias, or lands of components that
don't
> get populated. I haven't heard any of you talking about that, is this a
> risk?
>
> My first response was "naw, don't worry about it..",
> but then I turned to IPC-4554 and see a whole section (3.9) on "Whisker
> Issues"
> with Tables
> and Beautiful Photographs
> and advice on Measuring them,
> and methods of Rating them,
> and on and on...
>
> SERIOUSLY?
>
> (sigh)
>
> Jack
>
>
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