The CAP CER 820PF 50V C0G/NP0 0402 is a type of ceramic capacitor with a capacitance value of 820 picofarads. It has a tolerance of ±5% and can withstand a maximum voltage of 50 volts. This component is used in various electronic applications due to its stable temperature characteristics, as it is part of the C0G/NP0 dielectric class.