The CAP CER 390PF 1KV NP0 1808 is a specific type of ceramic capacitor. It has a capacitance value of 390 pF and a tolerance of ±10%. The rated voltage for this capacitor is 1000V, or 1kV. This component belongs to the C0G (NP0) class, which signifies its temperature stability characteristics. It comes in an 1808 metric package size (which is equivalent to 4520 in imperial measurements).