The CU4S0401BT-2140-00 from TDK is a RF & Microwave Isolator with Frequency 2.11 to 2.17 GHz, Bandwidth 60 MHz, Average Power Forward 2.5 W, Average Power Reverse 0.6 W, Insertion Loss 0.7 dB. Tags: Surface Mount, Surface Mount Isolator. More details for CU4S0401BT-2140-00 can be seen below.