Patent ID: 7547948
Filing Date: 2009-06-16
Classification: H01L

Abstract:
1. A semiconductor device including a bipolar junction transistor, comprising: a semiconductor substrate having a principal surface; a collector region of a first conductivity type formed in said semiconductor substrate from said principal surface; a base region of a second conductivity type opposite to said first conductivity type, formed in said collector region from said principal surface; an emitter region of said first conductivity type, formed in said base region from said principal surface, forming an emitter-base junction reaching said principal surface; junction protection structure formed above said emitter-base junction reaching the principal surface comprising an insulator film formed on said principal surface, and a conductive electrode formed on said insulator film; at least one CMOS transistor, comprising: a field insulating film having a base aperture above said base region, a collector aperture above said collector region outside said base region and first and second MOS transistor apertures above said first and second wells, wherein the base region has a surface exposed at the principal surface in the base aperture, the junction protection structure has a layout configuration of closed loop lines within the base aperture, and the emitter region is formed in a region defined between the field insulating film and the junction protection structure with an emitter-base junction reaching the principal surface below the field insulating film and the junction protection structure.