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An ultralow-leakage power-rail electrostatic discharge (ESD) clamp circuit realized with only thin gate oxide devices and with silicon-controlled rectifier (SCR) as the main ESD clamp device has been proposed and verified in a 65-nm CMOS process. By reducing the voltage difference across the gate oxide of the devices in the ESD detection circuit, the proposed power-rail ESD clamp circuit can achieve an ultralow standby leakage current. In addition, the ESD-transient detection circuit can be totally embedded in the SCR device by modifying the layout structure. From the measured results, the proposed power-rail ESD clamp circuit with an SCR width of 45 μm can achieve 7-kV human-body-model and 350-V machine-model ESD levels under the ESD stress event while consuming only a standby leakage current in the order of nanoamperes at room temperature under the normal circuit operating condition with 1-V bias.