The ASR312A01-SS2 from Abracon LLC is a SAW Resonator with Frequency 311.925 to 312.075 MHz, Centre Frequency 312 MHz, Insertion Loss 1.5 to 2.5 dB, Capacitance 2.1 to 2.7 pF, Quality Factor Loaded 3500. Tags: Surface Mount, SAW Resonator. More details for ASR312A01-SS2 can be seen below.