The TC0523A from Tai-Saw Technology is a SAW Resonator with Frequency 399.925 to 400.075 MHz, Centre Frequency 400 MHz, Insertion Loss 0.9 to 2 dB, Capacitance 5.3 pF, Voltage 5 V. Tags: Surface Mount, SAW Resonator. More details for TC0523A can be seen below.