A CAP CER 820PF 63V C0G/NP0 1808 is a type of ceramic capacitor. It has an equivalent value of 820 picofarads and can withstand up to ±63 volts. The part number also includes the temperature coefficient, which is C0G or NP0 (1B), indicating that it has a very stable capacitance across different temperatures. Additionally, its case size is specified as 1808, which is equivalent to 4520 in metric units.