Patent ID: 7282760

Claim:
A vertical junction field effect transistor comprising: a drain semiconductor portion; a drift semiconductor portion placed on a principal surface of the drain semiconductor portion and having first to fifth regions extending in a predetermined axial direction intersecting with a reference plane extending along the principal surface; a buried semiconductor portion having a conductivity type opposite to a conductivity type of the drift semiconductor portion and placed along the reference plane on the first to fourth regions of the drift semiconductor portion; a plurality of gate semiconductor portions placed along the reference plane on the second to fourth regions of the drift semiconductor portion and having the same conductivity type as the conductivity type of the buried semiconductor portion; a channel semiconductor portion placed between the buried semiconductor portion and the plurality of gate semiconductor portions, and between the plurality of gate semiconductor portions, and having the conductivity type opposite to the conductivity type of the buried semiconductor portion; a connection semiconductor portion having the same conductivity type as the conductivity type of the channel semiconductor portion and connecting the plurality of gate semiconductor portions; a first aggregate semiconductor portion connecting the channel semiconductor portion on the first region of the drift semiconductor portion; a second aggregate semiconductor portion connecting the channel semiconductor portion on the fifth region of the drift semiconductor portion; and a source semiconductor portion placed above the first region of the drift semiconductor portion and connected to the first aggregate semiconductor portion; wherein the drift semiconductor portion has a sixth region provided on a principal surface thereof and extending in the direction intersecting with the principal surface, the transistor further comprising a third connection semiconductor portion having a conductivity type opposite to a conductivity type of the drain semiconductor portion and placed above the sixth region, wherein the third connection semiconductor portion is placed along the first aggregate semiconductor portion.