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The transistor began as a small, fragile point-contact device built at Bell Labs in 1947. It became the foundation of modern electronics because later designs could switch and amplify reliably, be manufactured in quantity, and fit together in integrated circuits. Today, MOSFETs and CMOS logic do much of the work inside processors and other digital systems.
Who invented the transistor, and when?
John Bardeen and Walter Brattain, working under William Shockley at Bell Telephone Laboratories, built the first working point-contact transistor in December 1947. IEEE History Center reporting dates the first successful amplification of an electrical signal with a solid-state point-contact device to December 16, 1947. Bell Labs publicly announced the invention on June 30, 1948, a date recorded by the Computer History Museum.
The first transistor was a laboratory breakthrough, not yet the compact, repeatable component familiar today. It used a semiconductor surface and closely spaced contacts to amplify a signal. Unlike a vacuum tube, it did not need a heated cathode or a bulky glass envelope, avoiding the associated heater power and size.
Transistors soon found practical roles in telephone amplification and hearing aids. IEEE History Center identifies hearing aids in 1952 as an early consumer application.
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What does a transistor do?
A transistor is a three-terminal semiconductor device that can amplify an electrical signal or act as a switch. In amplification, a small input controls a larger output; in switching, the device controls whether current can flow in a circuit. Those two functions let transistors serve both analog systems and digital logic.
The basic job stayed familiar as transistor designs changed. What evolved was the way a device is built, the material it uses, how its terminals control conduction, and how many devices manufacturers can combine on a chip.
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How do early transistors differ from modern transistor families?
| Device or family | Structure or material | How it is controlled | Role in the transition |
|---|---|---|---|
| Point-contact transistor | Early semiconductor-surface device with closely spaced contacts | The contacts produce amplification at the semiconductor surface | The first working transistor design; a laboratory breakthrough that demonstrated solid-state amplification |
| Junction transistor, including the BJT family | Junction-based semiconductor device; early devices included germanium, followed by silicon designs | A BJT is current-controlled | A more developed transistor family used in selected analog, high-speed and power applications |
| Silicon planar transistor | Silicon device made with planar processing | Control depends on the transistor architecture | Planar processing made devices more repeatable and compatible with integrated-circuit fabrication |
| MOSFET | Field-effect device with an insulated gate | Gate voltage creates or depletes a conducting channel between source and drain; steady-state gate current is very low | The dominant modern transistor family for integrated logic |
| CMOS | Complementary n-channel and p-channel MOSFETs | Logic is built from the complementary action of the two MOSFET types | A dense, low-static-power approach used to build integrated circuits such as processors and memories |
| GaN HEMT | Compound-semiconductor high-electron-mobility transistor | Not stated in the cited IEEE overview | Used in high-frequency, high-power-density applications, including 5G massive-MIMO base-station amplifiers and satellite communications |
There is no single speed, power or size figure that fairly captures “old” versus “modern” transistors: the term covers different structures designed for different jobs. The comparison is more useful when it focuses on device architecture, control mechanism, manufacturing scale and intended application.
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Why did MOSFETs and CMOS become central to computing?
A MOSFET uses an electric field from its gate voltage to control the channel between source and drain. Because its insulated gate draws very little current in steady state, MOSFETs are well suited to dense integrated logic. CMOS combines n-channel and p-channel MOSFETs, enabling logic circuits with low static power.
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Manufacturing changed alongside device design. Planar processing made transistors more repeatable and compatible with making integrated circuits. Complementary MOSFET logic then made it practical to build processors and memories as collections of devices on silicon, rather than wiring individual components together.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do transistors work in computers, phones and communications systems?
In digital electronics, transistors act as switches that make up logic circuits. Combining large numbers of switching devices lets an integrated circuit process information and store data; processors and memories can therefore be built on silicon rather than assembled from separately wired components. In phones and other electronics, transistors also support analog signal amplification as well as digital processing.
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The applications have widened far beyond the early telephone and hearing-aid uses. Transistors now serve in radios, computers and processors, while specialized devices such as GaN HEMTs are used in 5G infrastructure and satellite communications. Different transistor families persist because a device suited to dense logic is not necessarily the best fit for every analog, high-speed or power task.
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