Electrostatic discharge protection apparatus

An electrostatic discharge (ESD) protection apparatus, comprising:

• a first power rail, providing a first reference voltage;
• a second power rail, providing a second reference voltage;
• a detection circuit, generating a detection result according to whether electrostatic discharge (ESD) stress occurs on the first power rail;
• a first N-type metal-oxide semiconductor field-effect transistor (MOSFET), having a drain thereof coupled to the first power rail, a source thereof coupled to a common node, and a gate thereof serving as a first control node;
• a second N-type MOSFET, having a drain thereof coupled to the common node, a drain thereof coupled to the second power rail, and a gate thereof serving as a second control node;
• an intermediate power rail, providing an intermediate voltage between the first reference voltage and the second reference voltage;
• a first switching circuit, electrically coupled between the first power rail and the intermediate power rail, causing the first control node to be coupled to the intermediate power rail or to the first power rail according to the detection result;
• and
• a second switching circuit, electrically coupled between the first control node and the second power rail, causing the second control node to be coupled to the second power rail or to the first control node according to the detection result.