The MT18N3R9C500CT is a Multilayer Ceramic Capacitor (MLCC), a Surface Mount Device (SMD) with an SMT 0603 footprint, manufactured by Walsin. It has a RoHS certification, indicating that this component does not contain hazardous substances. This MLCC has a capacitance of 18nF, a voltage rating of 500V, and a temperature coefficient of ±10%. This capacitor is primarily designed for industry applications and equipment, such as power supplies, high frequency electronic circuits, and mains transformers.