Patent ID: 8933497
Filing Date: 2015-01-13
Classification: H01L

Abstract:
1. A semiconductor switch device including a plurality of semiconductor elements on a semiconductor substrate and constituting a switch circuit and a connection circuit connected to the switch circuit, each of the semiconductor elements comprising: a recess; a source electrode portion including a source electrode; a drain electrode portion including a drain electrode; and a gate electrode portion including a gate electrode projecting from a bottom surface of the recess and arranged between the drain electrode portion and the source electrode portion, wherein the switch circuit is constituted by at least one of the semiconductor elements in which the gate electrode has a rectangular external shape in section, the connection circuit includes at least one of the semiconductor elements in which the gate electrode has an external shape other than being rectangular in section, the recess has a multi-stepped shape including a first recess portion formed between the drain electrode portion and the source electrode portion, and a second recess portion formed around the gate electrode portion to be deeper than the first recess portion, the second recess portion having a recess width smaller than a recess width of the first recess portion, a ratio of the recess width of the second recess portion to the recess width of the first recess portion is larger in the semiconductor element including the gate electrode having a rectangular sectional shape than in the semiconductor element including the gate electrode having a sectional shape other than being rectangular, and a distance between an edge of the gate electrode of the switch circuit and an edge of the second recess portion of the switch circuit is larger than a distance between an edge of the gate electrode of the connection circuit and an edge of the second recess portion of the connection circuit.