Patent ID: 9035352
Filing Date: 2015-05-19
Classification: H01L

Abstract:
1. A lateral silicon controlled rectifier (LSCR), comprising: a substrate having a semiconductor surface which is p-doped; a first nwell and a second nwell spaced apart from one another in said semiconductor surface by a lateral spacing distance; a first n+ diffusion region and a first p+ diffusion region in said first nwell, wherein the first n+ diffusion region is connected directly to a high impedance node and the first p+ diffusion region is connected directly to a pad to be protected; a second n+ diffusion region entirely in said second nwell, wherein the second n+ diffusion region is connected directly to a ground reference; a second p+ diffusion region between said first nwell and said second nwell providing a contact to said semiconductor surface; dielectric isolation between said first n+ diffusion region and said first p+ diffusion region, along a periphery of said first nwell at said semiconductor surface, and along a periphery of said second nwell at said semiconductor surface, and a resistor coupling said second n+ diffusion region to said second p+ diffusion region.