The TC0634A from Tai-Saw Technology is a SAW Resonator with Frequency 849.80 to 850.20 MHz, Centre Frequency 850 MHz, Insertion Loss 1.45 to 2 dB, Capacitance 2.62 pF, Voltage 3 V. Tags: Surface Mount, SAW Resonator. More details for TC0634A can be seen below.