Patent ID: 8022479

Claim:
A semiconductor apparatus comprising: a semiconductor substrate; an insulating film provided on the semiconductor substrate; a semiconductor film provided on the insulating film; a first region of a first conductivity type formed in the semiconductor substrate, the first region including; a first high-concentration region; a second high-concentration region; and a low-concentration region placed between the first high-concentration region and the second high-concentration region and having a lower impurity concentration than the first high-concentration region and the second high-concentration region; a second region of a second conductivity type formed in the semiconductor substrate and being in contact with the second high-concentration region; a third region of the first conductivity type formed in the semiconductor substrate; a first portion of the first conductivity type formed in the semiconductor film connected to the first high-concentration region; a second portion of the second conductivity type formed in the semiconductor film and being in contact with the first portion; a third portion of the first conductivity type formed in the semiconductor film; a first electrode connected to the first portion; a second electrode connected to the second high-concentration region; and a third electrode connected to the third portion, the first region being placed in a region including at least part of an area directly below the first portion, the third region being placed in a region including at least part of an area directly below the third portion and being connected to the third portion, a first current path extending from the first region through the second region to the third region being formed, and a second current path extending from the first portion through the second portion to the third portion being formed.