The CAP CER 91PF 50V C0G/NP0 0603 is a type of ceramic capacitor. It has a capacitance value of 91 picofarads and can withstand voltages up to 50 volts. This capacitor is part of the C0G/NP0 series, which is known for its stability and low loss factor. Its metric size is 1608, but it is also referred to as 0603 in non-metric measurements.