Patent ID: 8569867
Filing Date: 2013-10-29
Classification: H01L

Abstract:
1. A semiconductor device that has a rectification element, comprising: a semiconductor substrate; a first well region of a first conductivity type formed on the semiconductor substrate; a second well region of a second conductivity type formed on the semiconductor substrate; and a plurality of fins arranged over the first well region and the second well region at a first pitch in the same direction, wherein the first well region and the second well region are arranged to come in contact with each other in a direction along a short side of the fin to form a well region boundary parallel to a long side of the fin, a first pair of the fins are positioned so as to interpose the well region boundary therebetween, one fin of the first pair being a cathode region with a second conductivity type impurity diffusion layer region positioned in the first well region, and another fin of the first pair being an anode region with a first conductivity type impurity diffusion layer region positioned in the second well region, a second pair of the fins are positioned so as to interpose the first pair therebetween, one fin of the second pair being a well contact region with a first conductivity type impurity diffusion layer region positioned in the first well region, and another fin of the second pair being a trigger region with a second conductivity type impurity diffusion layer region positioned in the second well region, the rectification element includes the cathode region, the anode region, the well contact region, and the trigger region, each of the cathode region, the anode region, the well contact region, and the trigger region is connected to each wiring portion to form a PNP-type bipolar transistor and an NPN-type bipolar transistor, and the first well region is positioned at the outermost circumference of the semiconductor substrate, and the semiconductor device further includes an outermost circumferential fin positioned to be closer to the outer circumference from the well contact region, the outermost circumferential fin having a first conductivity type impurity diffusion layer region, and being in an electrically floating state.