The 2157-515-49-50 from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 389 to 641 MHz, Bandwidth 252 MHz, Center Frequency 515 MHz, Insertion Loss 3 dB, Rejection 30 dB. Tags: DIP, Lumped Component Filter. More details for 2157-515-49-50 can be seen below.