Patent ID: 9455253
Filing Date: 2016-09-27
CPC Classification: H01L

Claim Text:
1. A bidirectional switch formed inside and on top of a semiconductor substrate of a first conductivity type having a front surface and a rear surface, comprising: a first vertical thyristor having a rear surface layer of the second conductivity type with an active portion; a second vertical thyristor having a rear surface layer of the first conductivity type; a third vertical thyristor having a rear surface layer of the second conductivity type in common with the rear surface layer of the first vertical thyristor; a peripheral region of the second conductivity type surrounding the first, second, and third vertical thyristors, in contact with the rear surface layer of the third vertical thyristor, and further electrically connected with an intermediate layer of the second conductivity type of the third vertical thyristor located at a front surface of the substrate; a first metallization connecting the rear surface layers of the first and second vertical thyristors; and a structure having an insulation function, located between the rear surface layer of the third vertical thyristor and the first metallization, and extending under a portion of a periphery of the first vertical thyristor, said structure comprising a first region made of an insulating material coating the rear surface of the substrate, and a second region made of a semiconductor material of the first conductivity type occupying separate first and second areas, wherein the first region, first and second areas of the second region and the rear surface area of the second vertical thyristor surround the active portion of the first vertical thyristor.