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 ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________