The TC0637A from Tai-Saw Technology is a SAW Resonator with Frequency 433.715 to 433.865 MHz, Centre Frequency 433.79 MHz, Insertion Loss 1.2 to 1.7 dB, Capacitance 3.2 pF, Voltage 12 V. Tags: Surface Mount, SAW Resonator. More details for TC0637A can be seen below.