A voltage selector circuit may be coupled to transistors to protect one or more inputs of the transistor from exceeding a safe operating range. In one example, a cross-coupled pair of transistors may be coupled to a gate of a transistor to select between a first voltage and a cascoded voltage that is a safe bias voltage. Thus, the transistor may be protected from unsafe gate-to-source voltages. The voltage selector may be used to build circuits, such as invertors, level shifter, NAND gates, and NOR gates, that function with power supply voltages that may exceed the safe operating range of the transistors.