This 0805B821K500CT is a multilayer ceramic capacitor (MLCC) manufactured by Walsin. The part is an SMD/SMT size of 0805 with an 820 picofarad (pF) capacitance and rated for 50 volts. It is RoHS (Restriction of Hazardous Substances) compliant. This capacitor is ideal for high-temperature, high-frequency, or high-reliability applications.