![]() 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). ▼ Transistor technology timeline (summary) Year Table info: Year, Technology, Organization.
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