A ceramic capacitor with the designation CAP CER 51PF 50V C0G/NP0 0201 has a capacitance value of 51pF and can withstand voltages up to 50 volts. Its case size is specified as 0201, which corresponds to a metric dimension of 0603. The capacitor is classified as C0G or NP0, indicating that it exhibits a stable capacitance over temperature changes.