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April 2008

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Subject:
From:
bob wettermann <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, bob wettermann <[log in to unmask]>
Date:
Fri, 4 Apr 2008 11:33:17 -0700
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David:

There are two known public sources of this information:

1. Got to the recent APEX/IPC proceedings and there is a paper by CALCE

2. If you are an SMTA member search on the site and download the U of Binghampton NY paper

In both cases there was no changes in shear strength for reballed components (up to 5x).

You do have to watch what the end use environment is and as a service provider we always caution people to qualify the reballed components based on risk factors and end use environment making sure to perform the proper QA testing.

Regards

Bob Wettermann
BEST

David Tremmel <[log in to unmask]> wrote: Hello,

 

I am interested in reballing/rebumping BGAs and replacing the SAC305 solder
spheres with 62/2/36 but would like to know if there is any reliability data
or at least a white paper or study published on the subject.

 

If there are no papers or studies available, would anyone venture an opinion
on how will the extra silver (compared to 63/37) effect the solder joint?
Will the extra silver help lessen cyclic creep-fatigue?

 

 

Thank you in advance for your responses.

 

 

Thank you,

 

David Tremmel

Value Recovery


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Bob Wettermann
PH 847-767-5745

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