Patent ID: 8878283

Claim:
A self protecting quasi vertical drain extended MOS (QVDEMOS) device, comprising: one of a cathode or an anode region comprising: a first buried layer having a first conductivity type in a semiconductor body having a second conductivity type; an epitaxial (EPI) layer having either the first conductivity type above the first buried layer or the second conductivity type above the first buried layer, wherein the EPI layer having the second conductivity type is counter-doped by implantation of a doping having the first conductivity type; a first well having the second conductivity type in the EPI layer the first well situated over the first buried layer; a deep well having the first conductivity type in the EPI layer contiguous to the first well and extending down to the first buried layer; the other side of the cathode or anode region comprising: a shallow well having the second conductivity type in the EPI layer, wherein the at least one shallow well is spaced apart laterally from the first well and the first well is located between the shallow well and the deep well; and a shallow implant having the first conductivity type in the shallow well; a layer of gate dielectric material selectively patterned over the EPI layer; a layer of gate electrode material selectively patterned over the layer gate dielectric material; and wherein the gate electrode material and the gate dielectric material form a gate of the device and upon a bias being applied to the gate electrode material an electric field is generated which forms an inversion or channel region between the at least one shallow well and the EPI layer, wherein the first well, epitaxial layer and shallow well at least partly define one of coupled pnp and npn bipolar components; the shallow implant, shallow well and epitaxial layer at least partly define the other of the coupled pnp and npn bipolar components; and upon an ESD event occurring at an input node connected to the deep well and the first well, the coupled npn-pnp bipolar components are triggered, thereby shunting a current at the deep well to the shallow implants.