| 摘要 |
<P>PROBLEM TO BE SOLVED: To change the trigger voltage of a thyristor independently from the hold voltage when the thyristor is used as a protection element. <P>SOLUTION: A first first-conductive-type diffusion layer 120, a first second-conductive-type diffusion layer 130, a second first-conductive-type diffusion layer 150, and a second second-conductive-type diffusion layer 140 are arranged in this order. In the region in which the second second-conductive-type diffusion layer 140 and a first conductive-type layer 100 are contacted each other, these impurity concentrations of a portion located at the side surfaces of the second second-conductive-type diffusion layer 140 are higher than those of a portion located at the bottom surface of the second second-conductive-type diffusion layer 140. <P>COPYRIGHT: (C)2012,JPO&INPIT |
