The CAP CER 3900PF 250V C0G/NP0 2220 is a specific type of ceramic capacitor. It has a capacitance value of 3900 pF and operates at a voltage rating of 250 volts. The designation C0G/NP0 refers to the Class 1 temperature coefficient and NPO (Negative Positive Negative) dielectric. This component is designed for use in electronic circuits, with a metric case size of 2220.