Patent ID: 9202790
Filing Date: 2015-12-01
Classification: H01L

Abstract:
1. A semiconductor device for electrostatic discharge protection, comprising: a substrate; a first well formed in the substrate, the first well having a first conductivity type; a second well formed in the substrate, the second well having a second conductivity type different than the first conductivity type, the first and second wells being formed side by side and meeting at an interface; a first heavily-doped region having the first conductivity type and formed in the first well, the first heavily-doped region being positioned at a first distance from the interface; a second heavily-doped region having the second conductivity type and formed in the first well, the second heavily-doped region being positioned at a second distance from the interface; a third heavily-doped region having the second conductivity and formed in the second well, the third heavily-doped region being positioned at a third distance from the interface; and a fourth heavily-doped region having the first conductivity type and formed in the second well, the fourth heavily-doped region being positioned at a fourth distance from the interface, and the fourth distance being different from the third distance, wherein positions of the first and second heavily-doped regions are staggered along a direction parallel to the interface.