A ceramic capacitor with the designation CAP CER 3900PF 50V C0G/NP0 in a 1206 package has specific characteristics. It features a capacitance of 3900 pF and is rated for an operating voltage of ±50V. This component belongs to the C0G, also known as NP0, dielectric class which is known for its stability over temperature and time. The reference number (1B) and package size (1206 or 3216 in metric notation) are included in this designation for identification and compatibility purposes.