The CAP CER 18PF 630V C0G/NP0 1111 is a type of ceramic capacitor with specific characteristics. It has an electrical capacitance of 18 picofarads (pF) and can withstand a maximum voltage of 630 volts. The C0G designation indicates that the capacitor uses a specific type of ceramic material known as NP0, which has a stable temperature coefficient and is suitable for applications where minimal capacitance change with temperature is required. This capacitor is available in a metric package size of 2828.