An Integrated Circuit is a formal name for a component commonly termed chip or IC, that is a small electronic device made out of a semiconductor material.

The first integrated circuit was developed in the 1950s by Jack Kilby of Texas Instruments and Robert Noyce of Fairchild Semiconductor, now a part of Schlumberger.

Integrated circuits are used for a variety of devices, including microprocessors (CPUs), audio and video equipment, and automobiles. Integrated circuits are often classified by the number of transistors and other electronic components they contain:

• SSI (small-scale integration): Up to 100 electronic components per chip
  
• MSI (medium-scale integration): From 100 to 3,000 electronic components per chip
  
• LSI (large-scale integration): From 3,000 to 100,000 electronic components per chip
  
• VLSI (very large-scale integration): From 100,000 to 1,000,000 electronic components per chip
  
• ULSI (ultra large-scale integration): More than 1 million electronic components per chip
  

IC are usually packaged in a plastic or ceramic case with external connector pins.

Some ICs used in midibox designs:

Mouser Referenced Datasheets are given for example.

• 74HC165
• 74HC595
• 74HCT541
• 74HC00
• 6N138
• MOS4051
• TL072
• TL074 / LM324
• MCP600X
• MCP3208
• MCP3428
• MAX525
• CD22M3494
• PIC16F88