The CU4S0506BC-1542-00 from TDK is a RF & Microwave Circulator with Frequency 1.525 to 1.559 GHz, Bandwidth 34 MHz, Average Power Forward 5 W, Insertion Loss 0.95 dB, Isolation 12 dB. Tags: Surface Mount, Surface Mount Circulator. More details for CU4S0506BC-1542-00 can be seen below.