Patent ID: 7122859

Claim:
A semiconductor device comprising: a switching element for allowing a current to flow into a load, the switching element comprising a first insulated gate type field effect transistor; and a circuit for driving the switching element, the circuit comprising a second insulated gate type field effect transistor, wherein the switching clement and the circuit are formed on a common semiconductor substrate of a first conductivity type, wherein the first insulated gate type field effect transistor comprises a first semiconductor region of a second conductivity type disposed on one main surface of the semiconductor substrate, a second semiconductor region of the first conductivity type disposed on the first semiconductor region, a first gate electrode disposed through an insulating film on a surface at which a pn junction between the first and second semiconductor regions ends, and a first source region of the second conductivity type disposed at one side end of the first gate electrode within the second semiconductor region, and a first drain region of the second conductivity type disposed within the first semiconductor region, and wherein the second insulated gate type field effect transistor comprises a second source region of the second conductivity type disposed on the one main surface of the semiconductor substrate, a second drain region of the second conductivity type, and a second gate electrode disposed through an insulating film on the one main surface of the semiconductor substrate, between the second source region and the second drain region.