Hello,

When you reball, do you ever use 62/2/36?  Does the extra silver help/hurt
reliability?

Thank you,
 
David Tremmel


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Jueves, 01 de Mayo de 2008 09:00 a.m.
To: [log in to unmask]
Subject: Re: [TN] Pb-Free BGAs on a SnPb board

Hi Craig,

We have the BGA re-balled with SnPb spheres...

Steve 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Craig Sullivan
Sent: Thursday, May 01, 2008 8:30 AM
To: [log in to unmask]
Subject: [TN] Pb-Free BGAs on a SnPb board

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
[log in to unmask]

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