BIPOLAR SCR

A high-voltage bipolar semiconductor controlled rectifier (SCR) includes an emitter region having a first polarity and overlying a base region having a second polarity different from the first polarity; a collector region having the first polarity and lying under the base region; an anode region having the second polarity; a first sinker region having the first polarity and contacting the collector region, wherein the anode region is between the first sinker region and the base region; and a second sinker region having the first polarity and contacting the collector region, the second sinker region lying between the anode region and the base region, wherein an extension of the anode region extends under a portion of the second sinker region.