The CAP CER 3.9PF 100V C0G/NP0 0805 is a specific type of ceramic capacitor. It has a capacitance value of 3.9 picofarads with a tolerance of ±0.5 pF and operates at a voltage rating of 100 volts. This capacitor features the C0G, also known as NP0 (1B) dielectric material and comes in the compact 0805 (2012 metric) package size.