The CAP CER 4PF 50V C0G/NP0 0505 is a type of ceramic capacitor with specific capacitance and voltage ratings. It has a capacitance value of 4 pF ±0.05pF and operates at a maximum voltage of 50V. The C0G/NP0 classification indicates its temperature stability characteristics, and the 0505 package size refers to the metric equivalent (1313 in inches).