Patent ID: 8847305

Claim:
A semiconductor device having a first region in which a vertical semiconductor element is disposed and a second region in which a lateral semiconductor element electrically isolated from the vertical semiconductor element by an isolating structure is disposed, the semiconductor device comprising: a first conductivity type first semiconductor layer; a first conductivity type second semiconductor layer, provided on a surface of the first semiconductor layer, with an impurity concentration lower than that of the first semiconductor layer; a parallel pn-layer, provided in a first region of the second semiconductor layer, formed by a first conductivity type third semiconductor layer with an impurity concentration higher than that of the second semiconductor layer and a second conductivity type fourth semiconductor layer with an impurity concentration higher than that of the second semiconductor layer being alternately disposed in a horizontal direction with respect to a main surface of the second semiconductor layer; and an isolating structure comprising a buried isolating layer provided in a second region of the second semiconductor layer and having an impurity concentration the same as that of either the third semiconductor layer or fourth semiconductor layer.