Patent ID: 7994535

Claim:
A semiconductor device having a junction field-effect transistor, the junction field-effect transistor comprising: a source diffusion region and a drain diffusion region, which are formed in a first conduction-type semiconductor region, and each of which is constituted of a high-concentration diffusion region of the first conduction type, bottom portions of the source diffusion region and the drain diffusion region being in contact with the first conduction-type semiconductor region; a source electrode and a drain electrode formed on and contacted to the source diffusion region and the drain diffusion region, respectively; and a gate diffusion region, which is constituted of a second conduction type that differs from the first conduction type, and which is formed between the source diffusion region and the drain diffusion region, wherein: a first short-circuit preventing layer is formed so as to surround the source diffusion region and a second short-circuit preventing layer is formed so as to surround the drain diffusion region, a depth of the first and second short-circuit preventing layers is shorter than that of the source diffusion region and the drain diffusion region, at least one of the first and second short-circuit preventing layers is formed so as to be brought into contact with the one of the source diffusion region and the drain diffusion region surrounded by the first and second short-circuit preventing layers, respectively, and an insulating layer is disposed between the first short-circuit preventing layer and the source electrode so as to contact and cover an entire surface of the first short-circuit preventing layer.