The CU4S1001BT-830-00 from TDK is a RF & Microwave Isolator with Frequency 815 to 845 MHz, Bandwidth 30 MHz, Average Power Forward 20 W, Average Power Reverse 1 W, Insertion Loss 0.7 dB. Tags: Surface Mount, Surface Mount Isolator. More details for CU4S1001BT-830-00 can be seen below.