Abstract:As the volume shrinking of electronic products becomes a trend, the dimensions of solder joints have devoted to scale down. With a smaller solder bump, the current density of solder bump gets higher. Electromigration becomes a very serious reliability issue. The two Ag-contents of SnAg solder bump influenced on electromigration lifetime in the fine pitch of the flip chip package. The tri-layer Ti/Cu/Ni UBM has a 75 µm in diameter and the bump pitch is 150 µm. The passivation opening is defined 50 µm on the Al … Show more
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