A capacitor with the designation CAP CER 3900PF 50V C0G/NP0 1206 is a 1206-sized ceramic component. It has a capacitance of 3900 pF and operates within a voltage range of -55 to +125 °C, or 50V DC when referring to its standard temperature coefficient. The C0G or NP0 temperature coefficient classification signifies that this capacitor exhibits minimal change in capacitance due to variations in ambient temperature.