The FN-3815W from Filtronetics is a Low Pass RF Filter with Frequency DC to 626 MHz, Stopband Frequency up to 2 GHz, 3 dB Cutoff Frequency 626 MHz, Insertion Loss 0.5 dB, Rejection 40 to 70 dBc. Tags: Surface Mount. More details for FN-3815W can be seen below.