Bipolar junction transistor
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A bipolar junction transistor is a type of transistor that uses both electrons and electron holes as charge carriers. In contrast, a unipolar transistor, such as a field-effect transistor, uses only o
Typical individual BJT packages. From left to right: SOT-23, TO-92, TO-126, TO-3
Die of a 2N2222 NPN transistor: the NPN materials are made in layers with the collector at the bottom. Bond wires connect metalization on the base to the left lead, and emitter to the right. The collector is connected to the can with a third external lead.
Transistor
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A transistor is a semiconductor device used to amplify or switch electrical signals and power. It is one of the basic building blocks of modern electronics. It is composed of semiconductor material, u
Julius Edgar Lilienfeld proposed the concept of a field-effect transistor in 1925.
John Bardeen, William Shockley, and Walter Brattain at Bell Labs in 1948; Bardeen and Brattain invented the point-contact transistor in 1947 and Shockley invented the bipolar junction transistor in 1948.
A replica of the first working transistor, a point-contact transistor invented in 1947