The SF2251E from Murata is a Band Pass Filter with Frequency 1.56 to 1.64 GHz, Bandwidth 40 MHz, Center Frequency 1600 MHz, Insertion Loss 3.15 to 5 dB, Power 0.01 W. Tags: Surface Mount, Ceramic, Surface Mount, RF SAW Filter, Ceramic Filter. More details for SF2251E can be seen below.