The CU4S0401AT-881-00 from TDK is a RF & Microwave Isolator with Frequency 869 to 894 MHz, Bandwidth 25 MHz, Average Power Forward 2.5 W, Average Power Reverse 0.6 W, Insertion Loss 0.85 dB. Tags: Surface Mount, Surface Mount Isolator. More details for CU4S0401AT-881-00 can be seen below.