The C1005NP0399CGT is a 3.9pF 50V 0402 surface-mount multilayer ceramic capacitor (MLCC - SMD/SMT) manufactured by Darfon. It is a RoHS-compliant component, meaning that it is lead-free and suitable for use in products as part of the regulations concerning hazardous substances. It has a wide range of applications depending on the application's requirements, including timing, coupling, decoupling, energy storage, and high-frequency filtering.