The part number is 0805Y0639P10DQT. This corresponds to a ceramic capacitor with specific characteristics and dimensions. It has a capacitance value of 9.1 pF, tolerance of ±0.5pF, and operates at a voltage rating of 63V. The capacitor is housed in an 0805 case size, also known as a 2012 metric size, and belongs to the C0G/NP0 class, which implies it has a high stability over temperature.