Patent ID: 8928084
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. An ESD protection device arranged to be active at a triggering voltage (Vtl) for providing ESD protection, the ESD protection device comprising: a semiconductor layer of a first conductivity type; a first region of the first conductivity type formed in the semiconductor layer, the first region extending from a surface of the semiconductor layer; a well region of a second conductivity type formed in the semiconductor layer extending from the surface of the semiconductor layer; a second region of the second conductivity type formed in the well region, the second region being coupled to a second current electrode (B) of the semiconductor device; a third region of the first conductivity type formed in the well region, the third region being coupled to a third current electrode (E) of the semiconductor device; a fourth region of the first conductivity type formed in the first region, the fourth region being coupled to a first current electrode de (C) of the semiconductor device; and a floating region of the second conductivity type formed in the semiconductor layer between the first current electrode (C) and the well region and extending from the surface of the semiconductor layer a predetermined depth, the floating region being separated from the well region by a predetermined distance, a value of the predetermined distance causes the floating region to be located within a depletion region of a PN junction between the well region and the semiconductor layer when the ESD protection device is active, wherein the floating region has a doping concentration greater than 10