Patent ID: 11908895
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. An electrostatic discharge protection device, comprising:
an emitter region on a semiconductor substrate;
a base region surrounding the emitter region on the semiconductor substrate;
a first collector region surrounding the base region on the semiconductor substrate;
a second collector region surrounding the first collector region on the semiconductor substrate;
a first conductivity-type drift region surrounding both the first collector region and the second collector region and extending between the first collector region and the second collector region and the semiconductor substrate;
a second conductivity-type drift region surrounding the emitter region and extending between the emitter region and the semiconductor substrate;
a second conductivity-type deep well between the base region and the semiconductor substrate, extending toward the semiconductor substrate deeper than the first conductivity-type drift region and the second conductivity-type drift region, having a first junction interface and a second junction interface with the first conductivity-type drift region and the second conductivity-type drift region, respectively, and having a first impurity concentration;
a second conductivity-type shallow well surrounding the base region in the second conductivity-type deep well and having a second impurity concentration that is higher than the first impurity concentration; and
a plurality of isolation portions between the emitter region and the base region, between the base region and the first collector region, and between the first collector region and the second collector region, respectively,
wherein the base region comprises a high concentration doped region, and a second conductivity-type body region connecting the high concentration doped region and the second conductivity-type deep well below the high concentration doped region, the second conductivity-type body region having a third impurity concentration, higher than the first impurity concentration and lower than the second impurity concentration, and
wherein the second conductivity-type body region is within the second conductivity-type shallow well.