The ACTR4019/434.42/QCC4A from Advanced Crystal Technology is a SAW Resonator with Frequency 434.345 to 434.495 MHz, Centre Frequency 434.42 MHz, Insertion Loss 1.8 to 2.4 dB, Capacitance 1.6 to 2.1 pF, Quality Factor Loaded 1800. Tags: Surface Mount, SAW Resonator. More details for ACTR4019/434.42/QCC4A can be seen below.