Dear Gaby:

A good method to minimize the propensity for tin wisker formation is
maximizing the topography of the underlying copper upon which the tin is
plated.  Having evaluated some chemical and mechanical methods, varying
copper topography appeared to have the largest influence on wisker
reduction.

Regards,
Ted Stern

-----Original Message-----
From: Gaby Bogdan [mailto:[log in to unmask]]
Sent: Monday, January 27, 2003 12:36 AM
To: [log in to unmask]
Subject: [TN] Tin whiskers


After storage of about 6 months we saw Tin whiskers inside the hole barrel
on Immersion Tin plated boards. It is the second time we found them, and the
batches were from two different suppliers.
According to our knowledge, they they are using the immersion tin
technologies which are said to prevent whisker formation when applied
properly.
What can be the cause?
Gaby
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