A field-effect transistor (FET) is a unipolar semiconductor device whose current is controlled by an electric field. It draws virtually no current or extremely low current at its input, and features high input impedance, low noise, good thermal stability, and simple manufacturing processes. It is widely used in large-scale and very-large-scale integrated circuits.
FETs, with their advantages of low power consumption, stable performance, and strong radiation resistance, are gradually replacing transistors in integrated circuits. However, they are still quite delicate. Although most have built-in protection diodes, they can still be damaged if not handled carefully. Therefore, caution is advised in their application.
