The EM4205/4305 from EM Microelectronic is a RFID Tag IC with Capacitance 210 pF, 250 pF, 330 pF, Frequency 100 to 150 KHz, Operating Temperature -40 to 85 Degree C, Storage Temperature -55 to 125 Degree C. More details for EM4205/4305 can be seen below.