The ACLM4539 from Cobham Signal & Control Solutions is a Limiter with Frequency 8 to 18 GHz, CW Flat Leakage 18 dBm, CW Flat Leakage 0.06 W, Flat Leakage 0.06 W, Flat Leakage 18 dBm. Tags: Module with Connectors, PIN Diode. More details for ACLM4539 can be seen below.