Prashant,

When we considered reballing (before Lattice announced we could get their latest FPGA with Sn/Pb balls) we researched this question (as we still refuse to use lead-free solder).  Here's what I learned:

1)  paper on reballing study from Steph Meschter at BAE Systems (sent to Steve G to post)

2)  contact [log in to unmask] to obtain the preliminary results they had from the NAVY SBIR they did last year.

3)  Martin reballer equipment www.martin-smt.de

4)  paper on reballing BGA reliability http://www.circuitmart.com/pdf/reliability_assessment_reballed_bgas.pdf which concludes 

"It was therefore inferred that the re-balled components exhibited adequate performance without any degradation and can serve as a solution for such a 'mixed' system. "

5)  www.retronixcertified.com  reballing in Mexico or Scotland 

6)  http://www.isipkg.com/bga_reballing.php reballing

7)  Jim Carrigan @ Premier Semiconductor Services LLC, 480-736-1970 X16 / 480-736-1188 Fax / www.premiers2.com (reballing)

Bob Landman
H&L Instruments, LLC
www.hlinstruments.com
LDF Coatings, LLC
www.ldfcoatings.com

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of prashant chopra
Sent: Thursday, November 11, 2010 5:52 AM
To: [log in to unmask]
Subject: [TN] BGA reballing -- ROHS to Lead solder balls

Hi,
 
We are having a ROHS BGA which we want to use in the Non-ROHS (leaded) process. We are looking at option of having the BGA reballed. We would have the ROHS solder balls removed and replaced with the Non-ROHS solder balls. 
 
I need help to know what can be the technical risks in using these BGA? Also, what can be the risk and issues associated with this reballing process?
 
Also, what are the critical precautions, checks and tests which should be done after the reballing of the BGA before we use them on the PWB?
 
Thanks to all for the support and advice.
 
Rgds
prashant


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