The CAP CER 3900PF 10V 0402 is a type of ceramic capacitor. It has a capacitance value of 3900 pF and operates within a voltage range of 10V. This component uses the metric size code 0402, which corresponds to dimensions in millimeters. The "±10" notation indicates a tolerance on the capacitance value, suggesting that it can deviate by up to ±10% from its nominal value.