Paul,
Did you do the EDX measure on a bulk Sn96Ag4 (i.e., piece of solder wire or solder paste reflowed on a glass slide) or did you do the measurement on a cross section of a solder joint.  If you did the EDX on a cross section of a solder joint then I would look to see if there is another source of Pb that contaminated the solder joint.

Regards,
George
George M. Wenger
Reliability / FMA Engineer
Base Station and Subsystems Group
Andrew Corporation, 40 Technology Drive, Warren, NJ 07059 (908) 546-4531 [log in to unmask]


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Stolar, Paul W
Sent: Monday, April 11, 2005 10:08 AM
To: [log in to unmask]
Subject: [TN] Pb-Free


Does anyone think that 3.5% Pb in a SN96AG4 (aka Pb-free) is abnormal? I
think it is, but I have doubters here. This was measured by EDX.

Does anyone have any evidence what this does to reliability?
Specifically mechanical cycling.

Paul Stolar
Materials/Reliability Engineer
Manufacturing Reliability Lead Engineer
Baker Atlas
713-625-5376

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