Patent ID: 7884008

Claim:
A method of forming a semiconductor device from a semiconductor wafer including a semiconductor substrate having a first surface, a second surface opposite the first surface, and a circuit element formed on the first surface, the method comprising: forming an electrode pad disposed on the first surface of the semiconductor substrate, electrically coupled to the circuit element; forming an interlayer dielectric film on the first surface of the semiconductor substrate, the interlayer dielectric film having a through hole extending to the electrode pad, the through hole having an inner wall; forming a first metal layer on the electrode pad and on the interlayer dielectric film, including the inner wall of the through hole; forming a first conductive pattern on the first metal layer; forming a protective layer sealing the first-surface side of the semiconductor substrate, the protective layer having an opening exposing part of the first conductive pattern; forming a bump electrode covering said opening, the bump electrode being electrically coupled to the exposed part of the first conductive pattern; and forming a conductive nub disposed on the first metal layer below the opening in the protective layer, wherein the first conductive pattern includes a first part formed on the conductive nub and projecting from the opening in the protective layer, a second part formed in the through hole, and a third part formed on the interlayer dielectric film to link the first and second parts, and the bump electrode is formed on the first part of the first conductive pattern.