The ASR315S2 from Abracon LLC is a SAW Resonator with Frequency 314.925 to 315.075 MHz, Centre Frequency 315 MHz, Insertion Loss 1.7 to 2.4 dB, Capacitance 2.4 pF, Quality Factor Loaded 1500. Tags: Surface Mount, SAW Resonator. More details for ASR315S2 can be seen below.