The Bell Lab's work on the transistor emerged from war-time efforts to produce extremely pure germanium 'crystal' mixer diodes, used in radar units as a frequency mixer element in microwave radar receivers. John Bardeen, William Shockley and Walter Brattain at Bell Labs, 1948 The MOSFET has since become the most widely manufactured device in history. MOSFETs use even less power, which led to the mass-production of MOS transistors for a wide range of uses. The MOSFET (metal–oxide–semiconductor field-effect transistor), also known as the MOS transistor, was invented by Mohamed Atalla and Dawon Kahng at Bell Labs in 1959. Shockley introduced the improved bipolar junction transistor in 1948, which entered production in the early 1950s and led to the first widespread use of transistors. John Bardeen, Walter Brattain and William Shockley invented the first working transistors at Bell Labs, the point-contact transistor in 1947.

The principle of a field-effect transistor was proposed by Julius Edgar Lilienfeld in 1925. Transistors are broadly classified into two categories: bipolar junction transistor (BJT) and field-effect transistor (FET). The introduction of the transistor is often considered one of the most important inventions in history. The three individuals credited with the invention of the transistor were William Shockley, John Bardeen and Walter Brattain. Bell Labs was the research arm of American Telephone and Telegraph (AT&T). The transistor replaced the vacuum-tube triode, also called a (thermionic) valve, which was much larger in size and used significantly more power to operate.The first transistor was successfully demonstrated on December 23, 1947, at Bell Laboratories in Murray Hill, New Jersey. This can be used for amplification, as in the case of a radio receiver, or for rapid switching, as in the case of digital circuits. In the common case, the third terminal controls the flow of current between the other two terminals. Semiconductor device history Transistor technology timeline (summary)Ī transistor is a semiconductor device with at least three terminals for connection to an electric circuit.

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