The part number CAP CER 680PF 100V X7R 0402 refers to a specific type of ceramic capacitor. This component has a capacitance value of 680 picofarads (pF), operates within a voltage range of 100 volts, and falls under the X7R category, which indicates its dielectric properties. The "0402" designation specifies the metric size of the capacitor, equivalent to the imperial measurement 1005.