The CAP CER 3900PF 2KV X7R 2220 is a type of ceramic capacitor with the following specifications: it has a capacitance value of 3900 pF, a tolerance of ±20%, and a voltage rating of 2000V (or 2kV). It belongs to the X7R classification and has a case size designation of 2220. Additionally, its metric designation is 5750.