The ACTQ403/403.55/TO39 from Advanced Crystal Technology is a SAW Resonator with Frequency 403.475 to 403.625 MHz, Centre Frequency 403.55 MHz, Insertion Loss 6 to 8 dB, Capacitance 1.7 to 2.3 pF, Quality Factor Loaded 6500. Tags: Drop In, SAW Resonator. More details for ACTQ403/403.55/TO39 can be seen below.