The CAP CER 390PF 2.5KV X7R 1808 is a ceramic capacitor with specific characteristics. It has a capacitance value of 390 pF ±20 and can withstand an operating voltage of up to 2500V, which corresponds to 2.5kV. The X7R designation indicates that it belongs to the X7R dielectric class, a type of ceramic material commonly used in capacitors for its stability across various temperature ranges.