Maximum RF power transistor collector voltage

The RF operating voltage of power transistors designed for operation in the HF, VHF, and UHF regions has been found to be greater than previously realized. This higher operating voltage is attributed to the slow response of the device surface with respect to the operating frequency of the circuit. Since most devices have breakdown voltages which are initially surface limited, their voltage operation at the higher frequencies is superior to the 60-cycle curve tracer behavior.