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Trench-type insulated gate bipolar transistor

  • US 6,380,586 B1
  • Filed: 02/04/2000
  • Issued: 04/30/2002
  • Est. Priority Date: 02/05/1999
  • Status: Expired due to Term
First Claim
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1. A trench-type insulated gate bipolar transistor comprising:

  • a drift layer of a first conductivity type;

    well regions of a second conductivity type in the surface portion of the drift layer;

    emitter regions of the first conductivity type in the respective well regions;

    trenches extending from the emitter regions to the drift layer;

    gate electrodes, each thereof being buried in each of the trenches with a gate insulation film interposed therebetween;

    an emitter electrode in common contact with the emitter regions and the well regions;

    a collector layer of the second conductivity type on the back surface of the drift layer;

    a collector electrode located on the collector layer;

    wherein the well regions are formed selectively; and

    wherein the drift layer includes extended portions that extend between the well regions.

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