The CAP CER 1800PF 100V X7R 0402 is a type of ceramic capacitor. It has a capacitance value of 1800 pF and operates at a voltage of 100V. The X7R designation indicates that it belongs to the X7R group, which is a specific class of ceramic capacitors known for their stability across varying temperatures. This component comes in the compact 0402 (also referred to as Metric 1005) package size.