MSASU105CB5105MFNA01 is a capacitor part number. It represents a CAP CER 1UF 50V X5R 0402, which is a type of ceramic capacitor with the following specifications: 1 microfarad (µF) capacitance value, ±20% tolerance, and 50-volt working voltage rating. The "X5R" designation indicates its temperature coefficient and stability class. This component has a metric package size of 0402 (1005 in imperial measurements).