A 250V ceramic capacitor with the designations CAP CER 51PF 250V C0G/NP0 and a size of 1206 is specified. It has a capacitance value of 51 pF, tolerance of ±1%, and operates within a voltage range of 250 volts. The capacitor type is classified as C0G or NP0 (1B) in the metric system equivalent to 3216.