Transistor Invented
Bell Labs scientists invented the transistor, the building block of modern electronics
December 16, 1947
A Tiny Device That Changed Everything
On December 23, 1947, physicists John Bardeen, Walter Brattain, and William Shockley at Bell Labs in Murray Hill, New Jersey, demonstrated the first working transistor. The device was crude by modern standards — a small slab of germanium with two gold foil contacts, mounted on a curved spring. But when they connected it in a circuit, it amplified an electrical signal. They called it the "transfer resistor," shortened to transistor. The three inventors won the Nobel Prize in Physics in 1956. The transistor would go on to become the most manufactured object in human history.
Replacing the Vacuum Tube
Before the transistor, electronic circuits used vacuum tubes — fragile, bulky, power-hungry glass devices that burned out frequently. The earliest computers, like ENIAC (1945), used about 18,000 vacuum tubes, occupied an entire room, and consumed 150 kilowatts of power. Transistors were smaller, more reliable, used far less power, and could switch on and off much faster. The first transistor radio appeared in 1954. By the 1960s, transistors had replaced vacuum tubes in virtually all electronics. Then came the integrated circuit — dozens, then thousands, then billions of transistors etched onto a single silicon chip.
The Foundation of the Digital World
Today's computer chips contain hundreds of billions of transistors in a space the size of a fingernail. Each transistor acts as a tiny switch — on or off — representing the ones and zeros of binary code. Every smartphone, computer, car, medical device, and internet router runs on transistors. Moore's Law — the observation that the number of transistors on a chip roughly doubles every two years — drove five decades of exponential improvements in computing power. The digital revolution, the internet, artificial intelligence, and modern medicine all trace their roots to that germanium slab demonstrated in a New Jersey laboratory in December 1947.