The 2157-40-5-50 from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 39 to 41 MHz, Bandwidth 2 MHz, Center Frequency 40 MHz, Insertion Loss 1 dB, Rejection 40 dB. Tags: DIP, Lumped Component Filter. More details for 2157-40-5-50 can be seen below.