Patent ID: 7750377

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, second, third, and fourth regions extending in a predetermined axial direction intersecting with the principal surface; a buried semiconductor portion having a conductivity type opposite to a conductivity type of the drift semiconductor portion and placed on the first, second, and third regions of the drift semiconductor portion; a channel semiconductor portion placed along the buried semiconductor portion, having the conductivity type opposite to the conductivity type of the buried semiconductor portion, and electrically connected to the fourth region of the drift semiconductor portion; a source semiconductor portion placed on the channel semiconductor portion and the first region of the drift semiconductor portion; and a gate semiconductor portion having a conductivity type opposite to a conductivity type of the drain semiconductor portion and placed on the channel semiconductor portion and the third and fourth regions; wherein the gate semiconductor portion has a plurality of projections extending in a direction from the third region toward the fourth region, the channel semiconductor portion is placed between the projections, and the projections are connected to the buried semiconductor portion.