A ceramic capacitor with the designation CAP CER 390PF 500V C0G/NP0 1812. It has a capacitance of 390 pF and operates within a voltage range of ±5% at 500 volts. The capacitor is classified as a C0G or NP0 type, which indicates its stable temperature characteristic. The metric equivalent for the 1812 case size is 4532.