The TC0644A from Tai-Saw Technology is a SAW Resonator with Frequency 1249.4 to 1249.8 MHz, Centre Frequency 1249.6 MHz, Insertion Loss 1.2 to 2.2 dB, Capacitance 2.02 pF, Quality Factor Unloaded 4500. Tags: Surface Mount, SAW Resonator. More details for TC0644A can be seen below.