Patent ID: 9722061
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A bidirectional switch, comprising: a semiconductor substrate of a first conductivity type having a front surface and a rear surface; first and second adjacent thyristors connected in antiparallel extending vertically between the front surface and the rear surface of the substrate; a vertical peripheral wall of a second conductivity type connecting the front surface of the semiconductor substrate to the rear surface and surrounding said first and second adjacent thyristors; on the front surface, in a ring-shaped region of the substrate separating the vertical peripheral wall from the first and second adjacent thyristors, a first region of the first conductivity type, having a greater doping level than the semiconductor substrate, the first region having a shape of a band at least partially surrounding the first thyristor, wherein said first region does not extend into an adjacent region between the first and second adjacent thyristors; a second region of the first conductivity type located in a first well of the second conductivity type extending from and in contact with said vertical peripheral wall, the second region forming a gate of the bidirectional switch for actuating both the first thyristor and second thyristor.