A CAP CER 12PF 2KV C0G/NP0 1808 is a specific type of ceramic capacitor with a capacitance of 12 pF and an operating voltage of 2kV. It is classified as a COG or NP0 (1B) type, which indicates its stable temperature characteristics and low dielectric absorption. The designation "1808" refers to the metric size of the component, equivalent to a 4520 package in imperial measurements.