The 2157-455-8-50 from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 437 to 473 MHz, Bandwidth 36 MHz, Center Frequency 455 MHz, Insertion Loss 3 dB, Rejection 30 dB. Tags: DIP, Lumped Component Filter. More details for 2157-455-8-50 can be seen below.