The CAP CER 3900PF 500V C0G/NP0 is a specific type of ceramic capacitor. It has a capacitance value of 3900 pF and operates within the range of ±5% at a maximum voltage rating of 500V. The C0G/NP0 designation indicates that it belongs to the Class I, NPO (or COG) ceramic dielectric material group, which is known for its high stability and precision in temperature characteristics. This particular capacitor has a package size of 2225, also referred to as 5763 metric, and is identified by code 1B.