The MGV125-21-P55 from MACOM is a Varactor Diode with Capacitance 0.13 pF, Capacitance Ratio 3.1 to 7.3, Forward Continous Currenrt 100 mA, Power Dissipation 100 mW, Q factor 4000. Tags: Surface Mount, Ceramic. More details for MGV125-21-P55 can be seen below.