Patent ID: 8378485

Claim:
An electronic device, comprising: an electronic device substrate having a bump pad located thereover, said bump pad including top and side surfaces; an elemental nickel layer located over said top and side surfaces of said bump pad such that said bump pad is located between portions of said elemental nickel layer that are located over said side surfaces; a solder bump on said elemental nickel layer, wherein said solder bump is composed of an alloy of silver, tin and copper, said copper having a concentration in a range of about 0.5 wt % to about 4 wt %; and an intermetallic compound layer between said elemental nickel layer and said solder bump, wherein intermetallic compound layer includes: a first intermetallic compound sublayer adjacent to said solder bump, said first intermetallic compound sublayer composed of an alloy of nickel, copper and tin, and a second intermetallic compound sublayer adjacent to said first intermetallic compound sublayer and said elemental nickel layer, said second intermetallic compound sublayer composed of an alloy of nickel and tin.