The CAP CER 3900PF 2KV X7R 1812 is a type of ceramic capacitor. It has a capacitance value of 3900 pF, with a tolerance of ±10%. This component also features a working voltage of 2000V (2kV). The designation "X7R" indicates that it falls within the X7R temperature coefficient category. The metric designation "1812" corresponds to an 18mm by 12mm footprint, while the imperial designation "4532" denotes the same size in inches.