The CAP CER 820PF 100V C0G/NP0 1812 is a type of ceramic capacitor with specific characteristics. It has a capacitance value of 820 picofarads and operates at a voltage rating of 100 volts, with a tolerance of ±2. The capacitor is classified as a C0G or NP0 device, indicating its temperature stability and dielectric properties are similar to those of a Norton (NP0) ceramic material.