The CAP CER 39PF 3KV C0G/NP0 1812 is a type of ceramic capacitor. It has a capacitance value of 39 picofarads and operates at a voltage rating of 3000 volts, or 3 kilovolts. This component is part of the C0G/NP0 series, which is known for its high stability and low temperature coefficient. The metric designation "1812" corresponds to an imperial size of 4532, indicating its dimensions.