The LS0540 from Herotek is a Limiter with Frequency 500 MHz to 4 GHz, Flat Leakage 0.025 W, Flat Leakage 14 dBm, CW Input Power 1 W, CW Input Power 30 dBm. Tags: Module with Connectors, Surface Mount, PIN Diode. More details for LS0540 can be seen below.