| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrostatic protective circuit capable of removing a trade-off relation by properly controlling discharge capability or turn-on time while improving latch-up resistance. SOLUTION: The electrostatic protective circuit comprises a thyristor 3 for discharging excess electric charges existent between a first power supply terminal 1 and a second power supply terminal 2 at a lower electric potential than the first power supply terminal; a trigger circuit 7 for supplying a current for turning the thyristor 3 on; and an electrostatic discharge element 10 disposed between the first power supply terminal 1 and the second power supply terminal 2 and in parallel with the thyristor 3, having a higher current supply capability compared with that of the trigger circuit 7 at the same power supply inter-terminal voltage, and further changing to an on state in a shorter time than the turn-on time of the thyristor 3 connected to the trigger circuit 7 and at a voltage lower than the turn-on voltage of the thyristor. COPYRIGHT: (C)2006,JPO&NCIPI
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