The CAP CER 5.1PF 25V C0G/NP0 0402 is a type of ceramic capacitor. It has a capacitance value of 5.1 picofarads with a tolerance of ±0.5 picofarads and operates at a voltage rating of 25 volts. The capacitor is designated as C0G, which indicates that it is a temperature stable, high frequency ceramic material known as NP0. It has a metric case size of 0402 (1005), making it suitable for use in compact electronic devices.