An electrostatic discharge clamp includes a first power source configured to provide a first power supply voltage, a power supply node coupled to the first power source and receiving the power supply voltage; and a first NMOS transistor and a second NMOS transistor coupled in series and between the power supply node and a VSS node. The stand includes a slide movably received in a radially extending channel defined in the bar whereby the stand is linearly movable with respect to the center axle in a radial direction. Also discussed is a method of manufacturing the device.