Could this be true only of 63-37 or would lead-free SAC alloys also be 
potentially guilty of causing soft errors?



----- Forwarded Message ----
From: "Gandhi, Mahendra S (AS)" <[log in to unmask]>
To: "[log in to unmask]" <[log in to unmask]>; 
"[log in to unmask]" <[log in to unmask]>; 
"[log in to unmask]" <[log in to unmask]>
Sent: Tue, March 6, 2012 8:38:40 AM
Subject: Help. Is this true??

 
Evidently regular solder has decaying Uranium in it, or somehow generates alpha 
particles, which are being blamed for upsets.  Some chips are moving to a 
special “low alpha” solder internally to avoid this problem on bump-grid-arrays 
in  flipchip parts.
 
 Mahendra Gandhi
SME - PWB Technologies
Aerospace Engineering
One Space Park, M5/1085A
Redondo Beach, Ca. 90278/*[log in to unmask]
(Office: 310.813.6857 Fax: 310.812.8630 

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