The CAP CER 18PF 630V C0G/NP0 1206 is a type of ceramic capacitor with a capacitance value of 18 pF and voltage rating of 630V. It falls under the C0G, also known as NP0, dielectric material classification. This component has a metric package size of 3216 (which corresponds to the imperial size 1206) and is designated by the code "1B" indicating its specific characteristics.