The MLD5123 from Massachusetts Bay Technologies is a Limiter Diode with Frequency Range 100 MHz to 20 GHz, CW Input Power 3 W, Input Peak Power 47 dBm, Insertion Loss 0.1 dB, Capacitance 0.1 to 0.12 pF. Tags: Chip. More details for MLD5123 can be seen below.