The specified part number is the CAP CER 12PF 250V C0G/NP0 1812. This capacitor has a capacitance value of 12 pF with a tolerance of ±1% and can withstand a maximum voltage of 250 volts. It has a metric size designation of 4532 and belongs to the C0G or NP0 type, which is known for its stability in temperature and frequency.