The CAP CER 1800PF 100V C0G/NP0 1812 is a specific type of ceramic capacitor. It has a capacitance value of 1800 pF and operates at a voltage rating of 100V. This component falls under the C0G, or NP0 classification, which indicates that it has very low temperature coefficients and high stability. The designation "1B" refers to one billion units in stock for this particular capacitor type. In metric measurements, this size is known as 4532.