Bell Labs seeks a solid-state replacement for bulky, power-hungry vacuum tube amplifiers used in telephone networks.
William Shockley assembles a team including John Bardeen and Walter Brattain to investigate semiconductor amplification.
Bardeen and Brattain successfully demonstrate the first working transistor using a germanium crystal and two closely spaced gold contacts.
William Shockley conceives a more robust and manufacturable design using a sandwich of semiconductor layers.
Bell Labs formally unveils the transistor to the press and scientific community.
Shockley, Bardeen, and Brattain jointly receive the Nobel Prize for their research on semiconductors and the transistor effect.
The Regency TR-1 becomes the first commercially mass-produced transistor radio, launching consumer solid-state electronics.
Jack Kilby and Robert Noyce independently develop methods to fabricate multiple transistors on a single chip.
Intel releases the 4004, the first commercially available microprocessor, packing thousands of transistors onto a single chip.
Modern integrated circuits contain billions of transistors, powering smartphones, computers, and global digital infrastructure.
In 1971, Intel introduced the 4004 microprocessor, designed by Federico Faggin, Ted Hoff, and Stanley Mazor, containing approximately 2,300 transistors on a single silicon chip. This achievement built directly on the transistor and integrated circuit innovations of the previous two decades, laying the technical foundation for personal computers, embedded systems, and the broader digital revolution that would follow in subsequent decades.