The CAP CER 51PF 630V C0G/NP0 1206 is a type of ceramic capacitor. It has a capacitance value of 51 picofarads with a tolerance of ±2, and it can withstand a maximum voltage of 630 volts. This capacitor is classified as C0G or NP0 (1B) and is in the 1206 package size, which is equivalent to a metric 3216 size.