| 摘要 |
A protection circuit includes a first primary-type transistor; a secondary-type transistor; a circuit protection element; and a second primary-type transistor. The first primary-type transistor includes a drain terminal connected to a first terminal to which a first voltage is applied. The first primary-type transistor further includes a gate terminal, a source terminal, and a bulk terminal each connected to a second terminal to which a second voltage is applied. The first primary-type transistor responds to an excessive voltage applied to the first terminal as a forward direction response to discharge the excessive voltage to the second terminal, thereby protecting an internal circuit from the excessive voltage.
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