Patent ID: 7245466

Claim:
An electrostatic discharge protection device comprising: a silicon controlled rectifier (SOR) constructed on a base region of a first conductivity type, the SOR including a well region of a second conductivity type formed in the base region, a first region of the first conductivity type formed in the well region, a second region of the second conductivity type formed in the well region, a third region of the first conductivity type formed in the base region, and a fourth region of the second conductivity type formed in the base region; an external pumping circuit comprising a transistor coupled to the well region or the base region, the transistor providing a pump current during an ESD event effective to lower the potential of the well region or the base region to which the transistor is coupled; and a fifth region of the second conductivity type formed at the interface between the well region and the base region, the transistor being coupled to the well region through the fifth region, wherein the fifth region having a first width and the first region, the second region, the third region, and the fourth region, each having a third width, the third width being greater than the first width of the fifth region.