Some of our customers have required what we refer to as Bright Acid Tin 
for a final finish. This is an electroplated finish that co-deposits 
organics to control tin whiskers. It's an old, relatively inexpensive 
finish, but I feel it's uses are somewhat limited. Optional, but not 
recommended but maybe for Class 1 and 2 product.



Cedric ORAIN <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
06/30/2010 12:03 PM
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Cedric ORAIN <[log in to unmask]>


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Subject
[TN] Bright tin






Hello all,

I've been proposed Bright Tin as PCB finishing. It is the first time I've
heard about this plating for PCB. 

Is someone is familiar with this process and could expose drawbacks and
benefit? 

Do you confirm that it is an electroplating process? Do I need to specify 
a
Nickel barrier or something lie that underneath the tin layer? Is the
thickness of tin is critical and has to be monitored carefully? 

I'm also concerned about tin whiskers with bright tin as it as been banned
from the plating of connectors and components due to its propensity to the
growth of whiskers.

Ok, it's a lot of questions!  I just want to be advised on what is 
important
to know about that subject.

Thanks in adavance for your bright advice.

Cedric ORAIN





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