Patent attributes
A semiconductor device includes a semiconductor substrate having a main surface and a semiconductor element having an insulated gate field effect portion formed in the semiconductor substrate. The semiconductor element includes an n− region, an n-type source region, a p-type base region, an n+ region, and a gate electrode. The n− region and the n-type source region are formed in the main surface. The p-type base region is formed in the main surface adjacent to the n-type source region. The n+ region is formed in the main surface adjacent to the p-type base region and opposed to the n-type source region with the p-type base region being interposed, and has an impurity concentration higher than the n− region. The n− region is formed in the main surface adjacent to the p-type base region and to the n+ region.
