×

BJT with ESD self protection

  • US 7,221,036 B1
  • Filed: 05/16/2005
  • Issued: 05/22/2007
  • Est. Priority Date: 05/16/2005
  • Status: Active Grant
First Claim
Patent Images

1. A circuit comprising:

  • a bipolar junction transistor having;

    a semiconductor material of a first conductivity type;

    an epitaxial material of the second conductivity type that contacts the semiconductor material, the epitaxial material having a top surface and a dopant concentration;

    a base region of the first conductivity type that contacts the epitaxial material, the base region having a depth measured normal to the top surface of the epitaxial material;

    an emitter region of the second conductivity type that contacts the base region, the emitter region having a dopant concentration;

    a sinker down region of the second conductivity type that contacts the epitaxial material, the sinker down region having a dopant concentration; and

    a ballasting region that contacts the top surface of the epitaxial material and lies between the base region and the sinker down region.

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