The XLF-252-D+ from Mini Circuits is a Low Pass RF Filter with Frequency DC to 2.5 GHz, Stopband Frequency 4.55 to 30 GHz, 3 dB Cutoff Frequency 3.22 GHz, Insertion Loss 1.3 dB, Rejection 15 to 18 dB. Tags: Die, Reflectionless Filter. More details for XLF-252-D+ can be seen below.