The CAP CER 3900PF 25V X7R 0603 is a ceramic capacitor with specific characteristics. It has a capacitance value of 3900 pico Farads (pF) and tolerance of ±20%. Its working voltage rating is 25 volts. This capacitor adheres to the X7R temperature coefficient classification, which signifies that it exhibits a high dielectric constant that remains relatively stable across varying temperatures. The component's dimensions are in accordance with the 0603 package size, also known as 1608 metric.