The SR5406 from Vanlong is a SAW Resonator with Frequency 303.875 MHz, Centre Frequency 303.875 MHz, Insertion Loss 1.6 to 2.2 dB, Capacitance 2.15 to 2.75 pF, Voltage 30 V. Tags: Surface Mount, SAW Resonator. More details for SR5406 can be seen below.