Patent ID: 8847390
Filing Date: 2014-09-30
Classification: B23K,H01L,H05K

Abstract:
1. A lead-free solder bump bonding structure comprising: a lead-free solder bump that bonds a Cu electrode of a first electronic component and a Cu electrode of a second electronic component, a large current with a current density of equal to or greater than 0.7×10 the lead-free solder bump comprising an alloy containing Sn as a primary component and inevitable impurities, and forming intermetallic compound layers in a boundary with the Cu electrode of the first electronic component and in a boundary with the Cu electrode of the second electronic component, and the intermetallic compound layer having scallop shapes with a difference in height that is equal to or greater than 4 [μm] between a bottom portion which is equal to or smaller than 30% of an average thickness of the intermetallic compound layer, and a peak portion adjacent to the bottom portion, at an interface with the lead-free solder bump, the number of scallop shapes in the intermetallic compound layer being equal to or less than 0.02 [portions/μm].