Good Morning, 

We are seeing an increased number of our customers that specify a Pb-Free
BGA when the rest of the board assembly is SnPb. Of course when we reflow at
the SnPb profiles, we don't always get a properly collapsed BGA. So we end
up reworking the BGA. We don't run a Pb-Free profile because we don't want
to risk damaging the SnPb components.

I am sure we aren't the only ones that are experiencing this. So, I have a
question or two:

What is everyone else doing when a customer requires a Pb-Free BGA on a SnPb
assembly? Many of the jobs I refer to are consignment, so it's not like we
can order the SnPb part from the get go.

What reliability issues do you see?

Are there any extra steps that your company takes to ensure the Pb-Free BGAs
collapse properly? 

Is there a "special" profile anyone uses for the best of both worlds?

What are the advantages, if any, to use a Pb-Free BGA on a SnPb assembly?

Thanks for any and all input.
Craig Sullivan
Manufacturing Engineer
MPL Incorporated
P: 607.266.0480
F: 607.266.0482
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