Electrostatic discharge protection circuit and operating method thereof

In some aspects of some embodiments of the present disclosure, an electrostatic discharge (ESD) protection circuit and a method of operating the same are disclosed. In some aspects, the ESD protection circuit includes a first transistor coupled to a pad, a second transistor coupled between the first transistor and a ground, a transistor stack coupled to the first transistor, and an ESD clamp coupled between the transistor stack and the ground.