The TC0554A from Tai-Saw Technology is a SAW Resonator with Frequency 433.645 to 434.795 MHz, Centre Frequency 433.72 MHz, Insertion Loss 1.7 to 2.2 dB, Capacitance 3.15 pF, Voltage 5 V. Tags: Surface Mount, SAW Resonator. More details for TC0554A can be seen below.