The part number MCASU063SCG4R3CFNA1J refers to a CAP CER 4.3PF 50V C0G/NP0 0201 ceramic capacitor from the manufacturer Adibuja. This component has a capacitance value of 4.3 pF with a tolerance of ±0.25pF and operates within a voltage range of 50V. The designation 'C0G' indicates that it belongs to the C0G (NP0) class, which is characterized by its high stability and low temperature coefficient.