Patent ID: 9257420
Filing Date: 2016-02-09
CPC Classification: H01L

Claim Text:
1. An overvoltage protection device comprising: a doped substrate of a first conductivity type having a first doping level, coated with a doped epitaxial layer of the second conductivity type having a second doping level; a first doped buried region of the second conductivity type having a third doping level greater than the second level, located at the interface between the substrate and the epitaxial layer in a first portion of the device, wherein the junction between the substrate and the first buried region forms a first diode having its conduction area of the second conductivity type coupled to a first terminal of the device via the epitaxial layer; and a second doped buried region of the first conductivity type having a fourth doping level greater than the first level, located at the interface between the substrate and the epitaxial layer in a second portion of the device, the junction between the second buried region and the epitaxial layer forms a second diode having its conduction area of the second conductivity type coupled to a second terminal of the device via the epitaxial layer.