A capacitor with the designation CAP CER 5.1PF 300V C0G/NP0 0505 has a capacitance value of 5.1 pF ±0.05pF and operates within a voltage range of 300V. It is classified as a ceramic capacitor, specifically using the C0G or NP0 dielectric material, with dimensions in the metric system equivalent to 1313 in the imperial measurement system (0505).