The TC0321A from Tai-Saw Technology is a SAW Resonator with Frequency 669.517 to 669.597 MHz, Centre Frequency 669.557 MHz, Insertion Loss 1 to 2 dB, Capacitance 3.27 pF, Quality Factor Unloaded 9636. Tags: Surface Mount, SAW Resonator. More details for TC0321A can be seen below.