The MLD5120 from Massachusetts Bay Technologies is a Limiter Diode with Frequency Range 100 MHz to 20 GHz, CW Input Power 15 W, Input Peak Power 66 dBm, Insertion Loss 0.2 dB, Capacitance 0.5 to 0.8 pF. Tags: Chip. More details for MLD5120 can be seen below.