Paul,
Could you provide more details regarding the kind of failing component(s) and the mechanical cycling you referred to?
From what you said, I assume the Pb is coming from the component termination ("forward" mixed solder joint).
"Stolar, Paul W" a écrit :
> The reason we looked at this particular solder joint is because it
> cracked. To analyze, we scraped off a piece with an exacto blade (like
> we have done many times before.)
>
> We are confident the Pb is in the sample.
>
> Paul Stolar
> Materials/Reliability Engineer
> Manufacturing Reliability Lead Engineer
> Baker Atlas
> 713-625-5376
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Wenger, George M.
> Sent: Monday, April 11, 2005 9:18 AM
> To: [log in to unmask]
> Subject: Re: [TN] Pb-Free
>
> 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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