Electrostatic discharge protection device

An electrostatic discharge (ESD) protection device, comprising:

• a substrate comprising a first conductive type;
• a first doped region formed in the substrate and comprising a second conductive type, wherein the first and the second conductive types are opposite conductive types;
• a second doped region formed in the substrate and comprising the second conductive type;
• a third doped region formed in the substrate, comprising the first conductive type and located between and separated from the first and the second doped regions;
• a gate formed on an area of the substrate between the first and the second doped regions and comprising a first through hole and a second through hole, wherein the first and the second through holes are both formed within a same contiguous layer for the gate;
• and
• a plurality of separated first contacts passing through the first through hole to directly contact with the third doped region,
• wherein the same contiguous layer comprises a first closed loop and a second closed loop defining the first and second through holes respectively.