The CAP CER 91PF 250V C0G/NP0 0505 is a type of ceramic capacitor with specific characteristics. It has a capacitance value of 91 pF and operates within a voltage range of ±250V. The C0G and NP0 classifications indicate its temperature stability and frequency characteristics, respectively. This capacitor is designed for use in applications requiring precise capacitance values and robust insulation properties.