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Discoloration of 100%Sn on top of a PPF leadframe

I have subjected PPF frames with 100% Sn plating to a L3 Preconditioning (30°C/60%RH), I also noticed the darkening of the leads. The Ni+Au-Ag flash should have blocked the Cu migration. Could this darkening be caused by other than the Cu to Sn intermetallic?

Mya Koh
Semiconductor - Singapore
2006

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