The Yageo 820KD20J is a Varistor Through Hole RoHS component. This device is designed to limit voltage by providing a high impedance to voltage spikes. It is designed to protect systems against transient overvoltage and prevent damage to electrical components. It is a nonlinear, symmetrical device with a high capacitance value in both directions. The RoHS compliant device has an operating temperature range from -40°C to 85°C, a DC voltage of 450V, a clamping voltage of 830V, a capacitance of 740-820pF, and a capacitance tolerance of ±10%. It is suitable for use in industrial and consumer electronics applications.