The 2157-2-5-50 from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 1.95 to 2.05 MHz, Bandwidth 100 KHz, Center Frequency 2 MHz, Insertion Loss 3 dB, Rejection 40 dB. Tags: DIP, Lumped Component Filter. More details for 2157-2-5-50 can be seen below.