The SF1143B-1 from Murata is a Band Pass Filter with Frequency 311 to 319 MHz, Bandwidth 4 MHz, Center Frequency 315 MHz, Insertion Loss 15.1 to 17 dB, Power 0.01 W. Tags: Surface Mount, Ceramic, Surface Mount, IF SAW Filter, Ceramic Filter. More details for SF1143B-1 can be seen below.