| 摘要 |
Disclosed is an ESD protection device which can reliably perform ESD protection, while sufficiently ensuring an attenuation at a desired frequency. The ESD protection device is provided with a configuration wherein a resistor (R) and an LC parallel resonance circuit (1) are connected in series on a signal line. Both the ends of the series circuit of the resistor (R) and the LC parallel resonance circuit (1) are connected to the ground by means of ESD elements (ESD1, ESD2). In such circuit configuration, when a signal line has a surge of static electricity, the ESD elements (ESD1, ESD2) are in the ON-state, and static electricity is discharged to the ground. When the ESD elements (ESD1, ESD2) are in the OFF-state, the ESD protection device functions as a lowpass filter, which is composed of a p-type C-R-LC-C connection and has an attenuation pole with respect to the desired frequency. |
