The LP3800K0603BT from Frontier Electronics is a Low Pass RF Filter with Frequency 3.3 to 3.8 GHz, Insertion Loss 0.55 dB, Rejection 17 to 20 dB, VSWR 1.90:1, Operating_Temperature -40 to 85 Degree C. Tags: Surface Mount, Ceramic Filter. More details for LP3800K0603BT can be seen below.