Patent ID: 6674147
Filing Date: 2004-01-06
Classification: H01L

Abstract:
A transistor comprising:a first conductivity tape semiconductor layer taken as a collector region; a base region consisting of a second conductivity type region provided in said first conductivity type semiconductor layer; an emitter region consisting of a first conductivity type region provided in said base region; a base electrode connecting portion having a first conductivity type provided in said base region; a base electrode provided on the surface of said base electrode connecting portion; and an emitter electrode and a collector electrode provided and electrically connected to said emitter region and said collector region, respectively, wherein Zener diode is formed so as to be broken down at a desired voltage at the p/n junction between said base electrode connecting portion and said base rejoin, by adjusting the impurity concentration of said base electrode connecting portion, said Zener diode being incorporated in series with the base.