This is a Multilayer Ceramic Capacitor (MLCC) of the SMD/SMT type with 100V rating, a capacitance of 0.3pF, C0G dielectric material, a 0402 package, a tolerance of 0.05pF, and is manufactured by Yageo with the part number CQ0402ARNPO0BNR30. This part is used in a variety of applications including timing applications, general purpose AC circuits, motor control systems, and more. It is also RoHS compliant.