IC (Integrated Circuit), that is, an integrated circuit, uses a semiconductor fabrication process to fabricate a plurality of transistors, resistors, capacitors, and the like on a small single crystal silicon wafer, and according to a multilayer wiring or a ramp wiring method. The components are combined into a complete electronic circuit. It is represented in the circuit by the letters "IC" (also with the literal "N", etc.).

IC integrated circuit classification:

ICs can be classified into bipolar integrated circuits and field effect integrated circuits according to device types, and MOS-IC belongs to the latter.

ICs can be classified into analog integrated circuits, digital integrated circuits, and analog-digital hybrid integrated circuits according to the type of processing signals.

ICs can be classified into small-scale, medium-scale, large-scale, ultra-large-scale integrated circuits, etc. according to their size (that is, the number of devices included in them).

ICs can be classified into low-power integrated circuits and high-power integrated circuits according to their output power.

IC can be divided into low-voltage integrated circuits and high-voltage integrated circuits according to its working voltage.

There are also low-power integrated circuits, microwave integrated circuits and the like.