The R903 from Qualcomm is a SAW Resonator with Frequency 315.5 MHz, Centre Frequency 315.5 MHz, Insertion Loss 1.5 to 1.9 dB, Capacitance 3.2 pF, Quality Factor Unloaded 7600 to 10500. Tags: Surface Mount, SAW Resonator. More details for R903 can be seen below.