The part number CAP CER 390PF 200V C0G/NP0 0805 refers to a specific type of ceramic capacitor. It has a capacitance value of 390 picofarads and can withstand a maximum voltage of 200 volts. The designation "C0G" or "NP0" indicates the temperature coefficient characteristic, which is stable over a wide range of temperatures. This component is packaged in an 0805 (2012 Metric) size.