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June 2007

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TechNet E-Mail Forum <[log in to unmask]>, Hfjord <[log in to unmask]>
Date:
Wed, 13 Jun 2007 19:12:49 +0200
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For each repeated reflow, more and more nickel participates in building
nickel/tin intermetallics. These IMCs are not ferromagnetic. So, let's
assume that Paymon's electroless nickel is just some 2-3 micrometers
thick, which is not unusual, then a growth of the IMC by some 0.1 to 0.5
micrometer for each reflow will probably have a positive effect = less
magnetic. 
Just an analogue thought
Inge


I think, there is one question to ask. If ENIG (or rather the presence
of Ni) is the source of the problem, then why does 2nd reflow improves
the yield?


Regards,

Vladimir
AMD

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