a sandwich consisting of three layers of doped semiconductor
a sandwich of differently dopedsections, either NPN or PNP
a semiconductor device commonly used for amplification
a three-terminal semiconductor device
An active semiconductor device formed by two P-N junctions whose function is amplification of an electric current. Bipolar transistors are of two types: NPN and PNP, depending on the manner in which the two P-N junctions are combined. Bipolar transistors have three sections: emitter, base, and collector. Operation of a bipolar transistor depends on the migration of both electrons and holes, in contrast to field-effect transistors, where only one polarity carrier predominates.
A transistor which operates by the action of minority carriers across a P/N junction; and is a current controlled device as opposed to a voltage controlled device.
A junction transistor having both majority and minority charge carriers.
The most common form of transistor.
A term used to denote the common two junction transistor types (NPN, PNP) as opposed to the field effect families of devices (JFET, MOSFET and so on.).
invented over 50 years ago, the bipolar transistor is a current-controlled device made from a sandwich of "n-" and "p-type" semiconductor material, resulting in "npn" and "pnp" transistors. The middle section of the transistor is known as the "base" and the other two sections as the "collector" and "emitter" (see transistor and field-effect transistor).
a transistor that uses both holes and electrons for conduction. A bipolar transistor has an emitter of one semiconductor type that emits carriers into a base region of opposite semiconductor type, and a collector region of same semiconductor type separated from the emitter by the base, the collector collects electrons that transit the base region. Modulating the current injected into the base terminal of a bipolar transistor will modulate the current flowing through the base from the emitter to the collector. Properly biased a signal injected into the base will result in an amplified signal appearing at the collector terminal.