Patent ID: 8728876

Claim:
A method of manufacturing a semiconductor device comprising a conductive fuse for circuit characteristic adjustment in a trimming element forming region, comprising: providing a semiconductor substrate; forming a multilayered wiring structure of a polysilicon wiring and a plurality of metal wirings on a surface portion of the semiconductor substrate; forming at least one conductive fuse in a portion of the multilayered wiring structure in the trimming element forming region; forming a first protection layer having openings to expose a surface portion of an draw-out pad electrode being part of a topmost metal wiring of the multilayered wiring structure and to expose a portion of the trimming element forming region; performing a trimming to blow out the conductive fuse through the opening of the first protection layer in the trimming element forming region; forming a second protection layer covering the trimming element forming region after the trimming; forming a plating electrode on the surface portion of the draw-out pad electrode exposed in the opening of the first protection layer by an electroless plating method after the second protection layer is formed; and forming a third protection layer comprising a solder resist on the semiconductor substrate so as to expose a portion of the plating electrode.