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June 2008

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Subject:
From:
John Maxwell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, John Maxwell <[log in to unmask]>
Date:
Tue, 17 Jun 2008 13:28:08 -0700
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Amol,
I used Sn99C in reflow with terrible results.

John

>Dear technetters,
>Is anybody using SN100 (or other high Sn alloys) for SMT reflow soldering applications? what have your experiences been with this alloy?
>
>I have a PCB with a BGA, that is cracking due to mechanical stress (that is not SMT process related), we have a combination of solder cracking, and pad cratering. The PCB currently uses SAC305. We also build a SnPb variant of the same exact board with no issues (the bare board material is different for SnPb and LF versions). I was therefore wondering whether SCA305 alloy properties could be a contributing factor this defect. How does the ductility and shear strength of SN100C compare to SAC305 and 67-37SNPb alloy?
>
>Regards,
>Amol
>
>
>
>
>
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