A system and method for persistent ID flag for RFID applications includes a method for operating an RFID tag. The method includes measuring a voltage potential of a supply voltage for the RFID tag, and turning on a pass gate that couples a memory cell to a data line used for reading or writing data, if the voltage potential is greater than a first threshold. An accumulated charge on the memory cell is also measured, and both the voltage potential and the accumulated charge are used to generate a control signal to set a state of the pass gate. The pass gate is turned off if the control signal is a true value.