The CU4S1001AT-860-00 from TDK is a RF & Microwave Isolator with Frequency 852 to 869 MHz, Bandwidth 17 MHz, Average Power Forward 20 W, Average Power Reverse 1 W, Insertion Loss 0.65 dB. Tags: Surface Mount, Surface Mount Isolator. More details for CU4S1001AT-860-00 can be seen below.