The ST25DV04K from STMicroelectronics is a RFID Tag IC with Capacitance 28.5 pF(Tuning), 100 pF(Load), 6 to 8 pF(Input), Current 0.5 to 1 mA, Frequency 13.56 MHz +/- 7 kHz, Operating Temperature -40 to 125 Degree C, Storage Temperature -65 to 150 Degree C. More details for ST25DV04K can be seen below.