A ceramic capacitor with the designation CAP CER 18PF 100V C0G/NP0 0603 has a capacitance of 18 picofarads and can handle voltages up to 100 volts. It is part of the C0G, or NP0, series, which is a type of ceramic capacitor known for its stability and low loss characteristics. The device is in the 0603 (1608 metric) size package.