Hi Guy - The NASA DoD Lead-free Project did test SAC solders with SnBi 
surface finishes so that information may be helpful (not exactly what you 
are looking for). The project results can be found on at:

http://www.teerm.nasa.gov/NASA_DODLeadFreeElectronics_Proj2.htm


Honeywell and Celestica have also published an investigation on 
tin/bismuth solders - check the APEX proceedings for that information.


Dave Hillman
Rockwell Collins
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From:   Guy Ramsey <[log in to unmask]>
To:     <[log in to unmask]>
Date:   11/11/2013 07:19 AM
Subject:        [TN] SnBi solder and SAC solder balls
Sent by:        TechNet <[log in to unmask]>



We have a customer in Korea using Samtec ?Solder Charge? connectors.  The
alloy is SAC38 ( 95.5, 3.8, 0.7). 

They want to stay Pb-free. 

 

Our 60 layer, 480mm by  585 mm by  6.5 mm thick board, with  6100+ 
embedded
capacitors cannot survive the Z axis expansion seen at SAC reflow.  Test
samples have survived 10 reflows at 210°C. 

 

Has anyone tried to qualify the performance of SAC solder with SnBi solder
paste?  Does it have the same problems associated with mixing SAC and SnPb
paste? 

 

Thanks, 

Guy


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