History of Electronic Devices

1st Generation

Valves

2nd Generation

Semiconductor Devices, Diode and single Transistor

3rd Generation

Small Scale Integrated Circuits (SSI): Less than 100 Transistors per Integrated Circuit or chip
Medium Scale Integrated Circuits (MSI): 100 to 1000 Transistors per Integrated Circuit or chip

4th Generation
Large Scale Integrated Circuits (LSI): 1000 to 10000 Transistors per Integrated Circuit or chip
Very Large Scale Integrated Circuits (VLSI): 10000 to 1 million Transistors per Integrated Circuit or chip

5th Generation
Ultra Large Scale Integrated Circuits (ULSI): over 1 million Transistors per Integrated Circuit or Chip

6th Generation

Name of this technology yet to be determined: Over one billion transistors per Integrated Circuit or Chip