The SF434020 from Filtronetics is a Band Pass Filter with Frequency 433 to 434.71 MHz, Bandwidth 6.8 MHz, Center Frequency 433.920 MHz, Insertion Loss 2.8 to 4 dB, Ripple 0.3 to 1 dB. Tags: Surface Mount, RF SAW Filter. More details for SF434020 can be seen below.