Patent ID: 6649975
Filing Date: 2003-11-18
Classification: H01L

Abstract:
A UMOSFET, comprising:a semiconductor substrate having a drift region of first conductivity type therein; a first stripe-shaped trench in said semiconductor substrate; an insulated gate electrode in said first stripe-shaped trench; a second stripe-shaped trench that extends in said semiconductor substrate in a direction parallel to said first stripe-shaped trench, said second stripe-shaped trench having a depth that is greater than a depth of said first stripe-shaped trench; an insulated source electrode in said second stripe-shaped trench; a base region of second conductivity type that extends in the drift region and between opposing sidewalls of said first and second stripe-shaped trenches; a source region of first conductivity type in said base region; and a source electrode that extends on said semiconductor substrate and is electrically connected to said source region and to said insulated source electrode.