The TC0643A from Tai-Saw Technology is a SAW Resonator with Frequency 499.956 to 500.035 MHz, Centre Frequency 500 MHz, Insertion Loss 1.7 to 2 dB, Capacitance 1.95 pF, Voltage 12 V. Tags: Surface Mount, SAW Resonator. More details for TC0643A can be seen below.