The ACTR434.4S/434.40/TO39 from Advanced Crystal Technology is a SAW Resonator with Frequency 434.325 to 434.475 MHz, Centre Frequency 434.4 MHz, Insertion Loss 1.3 to 2 dB, Capacitance 2.65 to 3.25 pF, Quality Factor Loaded 1650. Tags: Drop In, SAW Resonator. More details for ACTR434.4S/434.40/TO39 can be seen below.