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In this report, we investigated electro-migration behavior of two types of low temperature bonding. One was Sn-57 Bi using conventional C4 process. The other was Au-In Transient Liquid Phase bonding (TLP). Electron flow to induce the electro-migration was from substrate side (Ni pad) to chip side (Cu post) with current density of 40000A/cm2 at 150 degree C. In the case of Sn-57 Bi conventional C4...