The CAP CER 3.9PF 250V C0G/NP0 0805 is a ceramic capacitor with specific capacitance and voltage ratings. It has a capacitance of 3.9 picofarads ±0.5 picofarads, and it can withstand a maximum voltage of 250 volts. This capacitor conforms to the C0G/NP0 specification, which is commonly used for ceramic capacitors. Its package size is 0805 (2012 Metric), making it suitable for compact electronic designs.