This is a small form factor ceramic capacitor with the designation CAP CER 3PF 25V C0G/NP0 0402. It has a capacitance value of 3 pF and an accuracy tolerance of ±0.25pF, with a voltage rating of 25V. The C0G/NP0 classification indicates that it is a temperature stable ceramic capacitor with low losses and minimal change in capacitance over the operating temperature range. This component has a metric size code of 0402 (1005), which corresponds to a small surface mount package.