Patent ID: 8334596
Filing Date: 2012-12-18
Classification: H01L

Abstract:
1. A semiconductor device, comprising: an electrode pad provided on a semiconductor chip, the electrode pad comprising aluminum (Al) as a major constituent and further comprising copper (Cu); a coupling ball primarily comprising Cu, the coupling ball being coupled to the electrode pad so that a plurality of layers of Cu and Al alloys are formed at a junction between the electrode pad and the coupling ball; and an encapsulating resin comprising a halogen of less than or equal to 1000 ppm, the encapsulating resin covering at least the electrode pad and the junction between the electrode pad and the coupling ball, wherein a dimensional area of the plurality of layers of Cu and Al alloys is equal to or larger than 50% of a dimensional area of the junction between the electrode pad and the coupling ball, and wherein the plurality of layers of Cu and Al alloys comprises a CuAl