Integrated circuits (ICs) use a specific process to interconnect transistors, resistors, capacitors, inductors, and other components, along with the necessary wiring. These components are fabricated on a small piece or several small pieces of semiconductor chips or dielectric substrates, then packaged into a tube shell to form a microstructure with the required circuit functions. When choosing integrated circuits, you should pay attention to the following: 1. Choose according to the circuit requirements. 2. Before installing the integrated circuit into the circuit, fully understand the functions, electrical parameters, pin functions, and arrangement rules of the integrated circuit. 3. For integrated circuits with the same functions but different packages, determine the choice based on the conditions of use. 4. For circuits with higher requirements, select integrated circuits with high parameter indicators.