| 摘要 |
A surge protection apparatus, has a signal terminal, and first and second power supply terminals which are connected to the internal circuit to be protected, and first and second diodes which are connected between the signal terminal and the first and second power supply terminals, and a protective transistor acting as a discharge path for the surge voltage which is connected between the first and the second power supply terminals. As a result, even if the discharge capability of the internal circuit connected between the first and second power supply terminals is small, the surge voltage can be discharged in a short time through the protective transistor. Moreover, since the protective diode at the positive power supply side is connected to the power source of low impedance, the plural signal terminals will not be coupled by the junction capacitance. Thus, crosstalk does not occur between the plural signal terminals.
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