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Inter-Metallic Formation in Lead Free Solder After Thermal Cycling

inter-metallic-lead-free-solder

Inter-metallic formation in Lead Free Solder after Thermal Cycling on reedit:

The inter metallics you can see are:

Ag3Sn – Needle like structures

Cu6Sn5 – blotchy spots all around solder ball and typically the layer between the ball and the pad(s)

This cross section was taken from a Package on Package components which was thermally cycled from -25 C to 125 C (30 min dwell) for 1000 cycles.


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