Patent ID: 8471292

Claim:
A method of forming a semiconductor ESD device, the method comprising: forming a first doped region of a first conductivity type in a semiconductor body; forming a second doped region of a second conductivity type adjacent to the first doped region, wherein the second conductivity type is opposite the first conductivity type; forming a third doped region of the second conductivity type on the first doped region; forming a plurality of fourth doped regions of the first conductivity type on the second doped region; forming a fifth doped region of the first conductivity type on the second doped region; and forming a sixth doped region of the second conductivity type on the second doped region, wherein: the fifth and sixth doped regions are formed in close proximity to each other; each fourth doped region is formed to comprise an area larger than each fifth doped region, the fifth and sixth doped regions are formed in a subgroup, the subgroup sparsely distributed among the plurality of fourth doped regions, the fourth and fifth doped regions comprise a first node of the ESD device, and the third doped region comprises a second node of the ESD device.