Patent ID: 9385125
Filing Date: 2016-07-05
CPC Classification: H01L

Claim Text:
1. A semiconductor integrated circuit device, comprising: a second conductivity type region, provided in a surface layer of a first conductivity type semiconductor substrate, in which a circuit portion is formed and to which is applied a first potential, which is a high voltage potential of a power supply of the circuit portion; a first conductivity type well region, provided in the interior of the second conductivity type region and configuring the circuit portion, to which is applied a second potential, which is a low voltage potential of the power supply; a first conductivity type low potential region, provided in a surface layer of the first conductivity type semiconductor substrate on the outer side of the second conductivity type region, to which is applied a third potential lower than the second potential; a cavity selectively provided between the circuit portion and first conductivity type low potential region and between the first conductivity type semiconductor substrate and second conductivity type region; and a first conductivity type region penetrating the second conductivity type region and reaching the cavity.