Patent ID: 8004008

Claim:
A semiconductor device comprising: a semiconductor substrate of a first general conductivity type configured to operate as a collector region; a base region of a second general conductivity type formed on the substrate; an emitter region of the first general conductivity type formed in a surface portion of the base region so as to define a plurality of isolated portions of the base region in the surface portion in plan view of the semiconductor device, the isolated portions being arranged in a matrix form comprising rows extending in a first direction and columns extending in a second direction; a first insulating film disposed on the emitter region and the isolated portions of the base region; a plurality of first base electrodes each disposed on and in contact with corresponding isolated portions of the base region; a plurality of first emitter electrodes each disposed on and in contact with the emitter region; a second insulating film disposed on the first base electrodes and the first emitter electrodes; a second base electrode disposed on the second insulating film so as to overlay portions of the first base electrodes and portions of the first emitter electrodes and so as to be electrically in contact with the first base electrodes; a second emitter electrode disposed on the second insulating film so as to overlay portions of the first base electrodes and portions of the first emitter electrodes and so as to be electrically in contact with the first emitter electrodes, the second base electrode being smaller in area than the second emitter electrode, wherein all of the first base electrodes are elongated in the first direction of the matrix so that each first base electrode is disposed in a corresponding row of the matrix and is in contact with isolated portions of the corresponding row.