The CU4S0506BT-3540-00 from TDK is a RF & Microwave Isolator with Frequency 3.48 to 3.6 GHz, Bandwidth 120 MHz, Average Power Forward 5 W, Average Power Reverse 1 W, Insertion Loss 1 dB. Tags: Surface Mount, Surface Mount Isolator. More details for CU4S0506BT-3540-00 can be seen below.