The BBY53-03W from Infineon Technologies is a Varactor Diode with Capacitance 5.3 pF (CT1), 2.4 pF(CT2), Capacitance Ratio 2.2 (1/3V), Forward Continous Currenrt 20.0 mA, Peak reverse voltage 6 V, Reverse Voltage 6 V. Tags: Surface Mount. More details for BBY53-03W can be seen below.