The ACTR312/312.0/TO39 from Advanced Crystal Technology is a SAW Resonator with Frequency 311.925 to 312.075 MHz, Centre Frequency 312 MHz, Insertion Loss 1.3 to 1.8 dB, Capacitance 2.1 to 2.7 pF, Quality Factor Loaded 2200. Tags: Drop In, SAW Resonator. More details for ACTR312/312.0/TO39 can be seen below.