A high-quality ceramic capacitor with the designation CAP CER 51PF 630V C0G/NP0 1111 has a capacitance of 51 pF and operates within a voltage range of 630V. It features a temperature-compensating characteristic, denoted as C0G or NP0, indicating that it retains its value over a wide temperature range. The specific code "1111" signifies the capacitor's size, which is in the metric package (2828).