The MADL-000021-003000 from MACOM is a Limiter Diode with Frequency Range 10 MHz to 18 GHz, CW Input Power 3 W, Input Peak Power 49.54 dBm, Capacitance 0.38 pF, Series Resistance 21 Ohms. Tags: Surface Mount. More details for MADL-000021-003000 can be seen below.