The CAP CER 3900PF 250V C0G/NP0 1812 is a specific type of ceramic capacitor. It has a capacitance value of 3900 pF and operates at a voltage rating of 250V. This component belongs to the C0G or NP0 classification, which indicates its temperature stability characteristics. In metric terms, this capacitor measures 1812 (or 4.5 x 3.2 mm).