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The original unijunction transistor, or UJT, is a simple device that is essentially a bar of n-type semiconductor material into which p-type material has been diffused somewhere along its length, fixing the device parameter (the "intrinsic stand-off ratio"). The 2N2646 model is the most commonly used version of the UJT.
A programmable unijunction transistor (PUT) is a three-lead electronic semiconductor device which is similar in its characteristics to a unijunction transistor (UJT), except that its behavior can be controlled using external components. In a UJT, the base region is divided into two parts by the emitter.
For many purposes, a three-terminal device, such as a field-effect transistor, is more flexible than a device with only two terminals. Practical tunnel diodes operate at a few milliamperes and a few tenths of a volt, making them low-power devices. [14] The Gunn diode has similar high frequency capability and can handle more power.
Some NPN transistors with E-C reverse biased, known as negistor [58] unijunction transistor (UJT) [54] [43] thyristors [54] [43] triode and tetrode vacuum tubes operating in the dynatron mode [5] [59] Some magnetron tubes and other microwave vacuum tubes [60] maser [61] parametric amplifier [62]
The following other wikis use this file: Usage on da.wikipedia.org Unijunction-transistor; Usage on fr.wikipedia.org Transistor unijonction; Usage on id.wikipedia.org
The junction field-effect transistor (JFET) is one of the simplest types of field-effect transistor. [1] JFETs are three-terminal semiconductor devices that can be used as electronically controlled switches or resistors , or to build amplifiers .
It's one of those strange artefacts of circuit symbology. The emitter is closer to base 2 than it is to base 1 in a real live unijunction transistor (which the current physical diagram does not show at all). However, in the circuit symbol as used in circuit diagrams, the emitter is indeed shown as closer to base 1 than base 2.
Example partitioning of a system basis chip with bus interfaces (green), central logic (yellow), and outputs (red) for voltage regulators (LDO), high-side, and low-side switches (HS, LS)