The 2547-4000 from KR Electronics (A Division of NIC) is a Low Pass RF Filter with Frequency DC to 4 MHz, Stopband Frequency 8 MHz, 3 dB Cutoff Frequency 4 MHz, Lower Rejection 45 dB@8 MHz, Upper Rejection 1 dB@8 MHz. Tags: Module with Connector. More details for 2547-4000 can be seen below.
