The specified component is a CAP CER 18PF 3KV C0G/NP0 1812, which details its capacitance value at 18 pF with a tolerance of ±20. The capacitor has a high voltage rating of 3000V or 3kV and features a ceramic construction classified as C0G or NP0 material in the 1812 package size, equivalent to the metric designation 4532.