The SR5403 from Vanlong is a SAW Resonator with Frequency 303.825 MHz, Centre Frequency 303.825 MHz, Insertion Loss 1.2 to 1.8 dB, Capacitance 2.25 to 2.85 pF, Voltage 30 V. Tags: Surface Mount, SAW Resonator. More details for SR5403 can be seen below.