×

Insulated gate thyristor

  • US 6,091,087 A
  • Filed: 05/06/1997
  • Issued: 07/18/2000
  • Est. Priority Date: 05/09/1996
  • Status: Expired due to Fees
First Claim
Patent Images

1. An insulated gate thyristor comprising;

  • a first-conductivity-type base layer;

    first and second second-conductivity-type base regions formed in selected areas of a surface layer of a first major surface of said first-conductivity-type base layer, said first second-conductivity-type base region including a second-conductivity-type well region;

    a first-conductivity-type source region formed in a selected area of a surface layer of said first second-conductivity-type base region;

    a first-conductivity-type emitter region formed in a selected area of a surface layer of said second second-conductivity-type base region;

    a gate electrode formed through a gate insulating film on a surface of said first second-conductivity-type base region, an exposed portion of said first-conductivity-type base layer, and a surface of said second second-conductivity-type base region, which surfaces and exposed portion are interposed between said first-conductivity-type source region and said first-conductivity-type emitter region;

    a first main electrode that contacts both an exposed portion of said first second-conductivity-type base layer and said first-conductivity-type source region;

    a second-conductivity-type emitter layer formed on a second surface of said first-conductivity-type base layer;

    a second main electrode that contacts said second-conductivity-type emitter layer; and

    an insulating film covering entire areas of surfaces of said second second-conductivity-type base region and said first-conductivity-type emitter region;

    whereinsaid second second-conductivity-type base region has a diffusion depth that is smaller than a larger one of diffusion depths of said first second-conductivity-type base region and said second-conductivity-type well region.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×