| 摘要 |
<p>A semiconductor circuit system has first, second, and third external terminals (11, 15, 14) electrically separated from each other. The first external terminal is configured to receive a first power supply voltage in a normal operation. A protection circuit section is provided in the circuit system and includes a rectifier (SCR) to allow a surge current to pass therethrough. The rectifier has a current passage connected between a specific terminal connected to a protection target and the third external terminal. The protection circuit section further includes a first PMOS transistor (QP) configured to trigger the rectifier, based on a surge voltage inputted into the second external terminal. The first PMOS transistor has a current passage connected between the second external terminal and a base of the NPN transistor. The first PMOS transistor has a gate connected to the first external terminal.</p> |
