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.
Frustrated by exclusion from public credit for the point-contact device and motivated by its fragility and manufacturing difficulties, Shockley developed the theory for the junction transistor in early 1948. This design used a three-layer sandwich of p-type and n-type semiconductor material, offering better reliability, easier manufacturing, and superior performance compared to the delicate point-contact version, setting the template for nearly all transistors that followed.