The TC0542A from Tai-Saw Technology is a SAW Resonator with Frequency 399.97 to 400.03 MHz, Centre Frequency 400 MHz, Insertion Loss 0.9 to 2 dB, Capacitance 5.6 pF, Voltage 5 V. Tags: Surface Mount, SAW Resonator. More details for TC0542A can be seen below.