SAC0510M ～ SAC105 in melting. SAC0510M/SAC105 sphere: > 2X in DBT, > 8X in modified JEDEC drop test, ～40-60% better in TCT (-55°C/125°C), TCT of SAC0510M may outperform SAC305. The reduced hardness and much thinner and stable IMC layer on Ni are responsible for the superior non-fragility, while the stabilized IMC and grain microstructure are responsible for the TCT performance. Thinner IMC layer on Ni is more important than reduced hardness in improving non-fragility. High Tg brittle laminate can cause pad cratering.
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