The EMA8D1227P30C20D from ECHO Microwave is a Band Pass Filter with Frequency 1.21 to 1.25 GHz, Insertion Loss 1.2 dB, Rejection 20 to 35 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA8D1227P30C20D can be seen below.