The UIYDI3538A from UIY Inc. is a RF & Microwave Isolator with Frequency 250 MHz to 1.875 GHz, Average Power Forward 300 W, Average Power Reverse 30 W, Insertion Loss 0.3 to 0.45 dB, Isolation 18 to 30 dB. Tags: Drop-In, Drop-In Isolator. More details for UIYDI3538A can be seen below.