Hi Don,

We are struggling with the same issue. When we looked into this we
discovered that for many years we were getting "lead-free" component
leads but never called them that.

I too would like to see a compatibility list of acceptable component
lead finishes that can be used in a non-lead-free environment along with
qualification testing.

KennyB

-----Original Message-----
From: N Burtt [mailto:[log in to unmask]] 
Sent: Friday, January 05, 2007 1:23 AM
To: [log in to unmask]
Subject: Re: [TN] Qualification of ROHS Comonents with tin/lead Solder

I'd be willing to place a small bet that despite all due diligence you
have 
already unwittingly built some product using components with a tin/lead 
termination finish. Many suppliers flipped over to a lead-free finish
before the 
industry woke up to RoHS and often didn't care to give us much notice of
the 
fact. For most of us this didn't matter, but I'm glad those that should
care 
about this do!

Temperature should not be an issue as the parts without Sn/Pb coating
will 
now be designed to survive Pb-free temperatures. The only area where you

might be very concerned would be BGAs.   

The NPL in the UK did a good study of the reliability of mixed alloy
solder 
joints, but concentrated mostly on varying levels of Pb contamination in
Pb-
free alloys, so this won't help you and whisker detection per se was not
part 
of this project either.

Nigel

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