The CAP CER 390PF 1.2KV X7R 1812 is a ceramic capacitor with specific characteristics. This component has a capacitance value of 390 pF and an accuracy rating of ±20%. It also features a high voltage rating of 1200V, which corresponds to a kilovoltage (kV) rating of 1.2 kV. The X7R classification indicates that this is an X7R type ceramic capacitor with certain temperature-dependent dielectric properties. In terms of physical dimensions, the part number suggests it comes in an 1812 package size, also known as a metric package size 4532.