The part number CAP CER 1.9PF 100V NP0 0805 refers to a specific type of ceramic capacitor with the following characteristics: it has a capacitance value of 1.9 picofarads (pF), an accuracy rating of ±0.1 pF, and operates at a voltage of up to 100 volts. This capacitor is designed according to the C0G/NP0 dielectric class and features a compact 0805 metric size. It complies with the 2012 metric specifications.