Hi Dave

Despite my close involvement with this topic, I had not heard about reports of whiskering due to "excessive ionic cleanliness levels" and do you mean too clean or not clean enough.

We have a new project on this topic that looks to become a recipient of EU funding on this side of the pond. It would be very helpful if I could get a copy of such findings - as when they become available. Can you help?

Regards

Graham Naisbitt - KBO
Gen3 Systems - Engineering Reliability in Electronics

Email: [log in to unmask]
Phone: +44 (0)12 5252 1500
Web: www.gen3systems.com

On 24 Mar 2010, at 20:40, David D. Hillman wrote:

> Hi Steve - my comments:
> 
> 1) There are ImSn pwb surface finish formulations that will produce tin 
> whiskers and there are ImSn pwb surface finish formulations that will not 
> produce tin whiskers.  Conduct testing and don't completely believe the 
> Marketing literature.
> 
> 2) There are only a handful of published reports (3) which show a tin 
> whisker growing out of SAC305 solder. The reports show that excessive 
> ionic cleanliness levels were the root cause of the tin whiskers. There 
> are several industry investigation currently in progress on the specific 
> topic of ionic cleanliness levels and tin whiskers. Best guess is that 
> some of the investigations will be published later this year. 
> 
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
> 
> 
> 
> 
> Steve Kelly <[log in to unmask]> 
> Sent by: TechNet <[log in to unmask]>
> 03/24/2010 12:30 PM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to
> Steve Kelly <[log in to unmask]>
> 
> 
> To
> [log in to unmask]
> cc
> 
> Subject
> [TN] Tin Whiskers
> 
> 
> 
> 
> 
> 
> Hi All,
> 
> Two questions today:
> 
> 1)      Any known instances of tin whiskering when the finish is Immersion 
> Tin
> 
> 2)      Any known instances of tin whiskering after the immersion tin is 
> soldered with a RoHS compliant solder such as SAC 305.
> 
> Thanks. Steve Kelly
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> PFC_2col.png
> 
> CREATING A FLEXIBLE FUTURE
> 
> 
> 
> Steve Kelly
> 
> (416) 750-8433 (work)
> 
> (416) 750-0016 (fax)
> 
> (416) 577-8433 (cell)
> 
> 
> 
> 
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