| 摘要 |
A semiconductor device comprises a protection circuit for protecting a semiconductor integrated circuit. The protection circuit includes a first terminal supplied with a first voltage, a second terminal supplied with a second voltage lower than the first voltage, a first thyristor arranged between the first terminal and the second terminal, and a trigger circuit operative to break a current path for trigger current flowing in the first gate of the first thyristor when the first voltage is applied to the first terminal, thereby disabling the first thyristor to become conductive, and operative to form the current path for trigger current when a voltage other than the first voltage is applied to the first terminal, thereby enabling the first thyristor to become conductive. The trigger circuit includes a third terminal for controlling operation of the trigger circuit in accordance with the voltage on the first terminal, a switching element connected between the first gate of the first thyristor and the second terminal and having a control terminal connected to the third terminal, and a resistor connected between the third terminal and the second terminal.
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