The COIU3U50550G-XX from Cernex Inc is a RF & Microwave Isolator with Frequency 300 to 500 MHz, Bandwidth 30 MHz, Average Power Forward 100 W, Insertion Loss 0.5 dB, Isolation 50 dB. Tags: Module with Connector, Coaxial Isolator. More details for COIU3U50550G-XX can be seen below.