The part number is CAP CER 680PF 63V C0G/NP0 1206. It's a 1206-sized ceramic capacitor with specifications including capacitance of 680 pF and voltage rating of 63 V. This component belongs to the C0G, or NP0, class which is known for its temperature stability and low loss factor. The tolerance for this capacitor is ±5 percent, making it suitable for applications requiring precise values.