The CU4S1001AT-1880-00 from TDK is a RF & Microwave Isolator with Frequency 1.85 to 1.91 GHz, Bandwidth 60 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 CU4S1001AT-1880-00 can be seen below.