The CAP CER 51PF 300V C0G/NP0 0603 is a type of ceramic capacitor. It has a capacitance rating of 51 pF and can handle voltages up to 300V. The C0G/NP0 designation refers to its temperature compensation characteristics, making it suitable for applications where stability is crucial. This capacitor comes in the 0603 (1608 Metric) case size.