The SF1143B-4 from Murata is a Band Pass Filter with Frequency 302.3 to 327.7 MHz, Bandwidth 12.7 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-4 can be seen below.