The part number CAP CER 1PF 50V C0G/NP0 0201 refers to a specific type of ceramic capacitor. It has a capacitance value of 1 pF with a tolerance of ±0.1 pF and can withstand a voltage rating of up to 50 volts. The capacitor is packaged in the 0201 (0603 Metric) size and features C0G/NP0 dielectric properties, making it suitable for various applications where stability and reliability are crucial.