Patent ID: 6407414
Filing Date: 2002-06-18
Classification: H01L

Abstract:
An electrostatic discharge protection device located between a pad, a first voltage level, and a second voltage level, comprising:a first-type substrate coupled to the second voltage level; a first second-type well formed on the first-type substrate and coupled to the first voltage level; a second second-type well formed on the first-type substrate and coupled to the first voltage level; a first-type well formed between the first second-type well and the second second-type well; a third second-type well formed between the first-type substrate and the first-type well, and coupled to the first second-type well and the second second-type well; a first-type doped region formed on the first second-type well and coupled to the pad; and a second-type doped region formed on the first-type well and coupled to the second voltage level.