Patent ID: 6696341
Filing Date: 2004-02-24
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device having an ESD protection element, comprising the steps of:(a) preparing a semiconductor substrate of a first conductivity type mainly composed of a first material; (b) selectively forming a semiconductor region for ESD protection including a second material that extends a first depth from a surface of said semiconductor substrate, said second material having a smaller breakdown field than said first material; and (c) forming first and second semiconductor regions of a second conductivity type independently of each other in a surface of said semiconductor substrate so that no contiguous portion of the first and second semiconductor regions extend as deep or deeper than said first depth from the surface of the semiconductor substrate in order that first and second edge portions of the first and second semiconductor regions are formed opposed to each other and fully in said semiconductor region for ESD protection in the manufactured semiconductor device.