The three shared the 1956 Nobel Prize in Physics for their achievement. The first working device to be built was a point-contact transistor invented in 1947 by American physicists John Bardeen and Walter Brattain while working under William Shockley at Bell Labs. Some transistors are packaged individually, but many more are found embedded in integrated circuits.Īustro-Hungarian physicist Julius Edgar Lilienfeld proposed the concept of a field-effect transistor in 1926, but it was not possible to actually construct a working device at that time. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal. A voltage or current applied to one pair of the transistor's terminals controls the current through another pair of terminals. It is composed of semiconductor material, usually with at least three terminals for connection to an electronic circuit. The transistor is one of the basic building blocks of modern electronics. The gate is separated from the body by an insulating layer (pink).Ī transistor is a semiconductor device used to amplify or switch electrical signals and power. The 2N2907 and BC327 are PNP transistors.Metal-oxide-semiconductor field-effect transistor (MOSFET), showing gate (G), body (B), source (S) and drain (D) terminals. The BC84x family are surface mount versions. The BC54x are modern replacements for the BC10x family. The BC10x family of transistors have a maximum current of only 100mA and are not recommended. The much lower VCE sat will more than compensate for this anyway.
Metal can transistors normally have a lower thr J/ amb, so the PN2222 and BC337 possibly have a higher thermal resistance but this should not be a problem, in practice. But the slightly lesser VCEo of the PN2222 and BC337 will not be a problem for this application.
J temp max: 200 deg C (probably a misprint and should be DegCW)Īs the impedance of the buzzer is unknown it is not possible to say whether a lesser transitor will be OK. The SL100 is also in a metal can, so probably has a lower thermal resistance junction/ambient than plastic case types. The SL100 is an obsolete low power, high conductance transistor, rather than a small signal, high hFE (current gain) low noise transistor.
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