It is an heavy copper PCB (0.210 mm) that is use as a busbar for a high
current application, 60V application.

There are SMD components, PTH connectors and terminal for high current that
are screwed on large pads of the PCB.



-----Message d'origine-----
De : Stadem, Richard D. [mailto:[log in to unmask]] 
Envoyé : mercredi 30 juin 2010 19:19
À : TechNet E-Mail Forum; Cedric ORAIN
Objet : RE: [TN] Bright tin

What circuit board design or operating characteristic is driving the use of
bright tin as a final finish? 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Cedric ORAIN
Sent: Wednesday, June 30, 2010 12:04 PM
To: [log in to unmask]
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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