The CAP CER 47PF 4KV C0G/NP0 1808 is a ceramic capacitor with the following specifications: capacitance of 47 picofarads (pF), tolerance of ±10%, and voltage rating of 4000 volts (4kV). It conforms to the C0G or NP0 temperature coefficient, making it suitable for applications requiring stability over temperature changes. The capacitor's metric designation is 1808, which corresponds to a specific case size.