Zener diode

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Zener diode:

see diodediode
, two-terminal electronic device that permits current flow predominantly in only one direction. Most diodes are semiconductor devices; diode electron tubes are now used only for a few specialized applications.
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Zener diode

[′zē·nər ′dī‚ōd]
(electronics)
A semiconductor breakdown diode, usually constructed of silicon, in which reverse-voltage breakdown is based on the Zener effect.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Zener diode

A two-terminal semiconductor junction device with a very sharp voltage breakdown as reverse bias is applied. The device is used to provide a voltage reference. It is named after C. Zener, who first proposed electronic tunneling as a mechanism of electrical breakdown in insulators. See Semiconductor

A classic circuit to define a very stable current uses an operational amplifier and three stable resistors (see illustration). The voltage across the Zener itself defines a higher level from which the current is drawn. Thus, a stable noise-free Zener defines its own stable noise-free current. See Operational amplifier

The effect of temperature on the breakdown voltage can be nulled by having a second forward-biased junction, which has a small negative temperature coefficient, in series with the Zener junction. Such a device is called compensated Zener and has a breakdown voltage of 6.2 V rather than the normal 5.6 V (for the smallest possible temperature coefficient). Alternatively, a Zener junction can be part of an integrated circuit which adds a whole temperature controller to keep the silicon substrate at a constant temperature. For the very best performance, only four components are integrated into the silicon: the Zener, a heater resistor, a temperature-sensing transistor, and a current-sensing transistor. A separate selected dual operational amplifier then completes the current-and-temperature-control circuit. Such a circuit sets the chip temperature at, say 122°F (50°C), and the junction condition is then largely independent of ambient temperature. See Integrated circuits

The compact, robust Zener diode, with the circuits described to set its current and temperature, makes a fine portable voltage standard. This is used to disseminate the voltage level from national or accredited calibration laboratories to industry and to research laboratories. See Voltage measurement

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.
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As a franchise distributor for Rectron Semiconductor, New Yorker Electronics supplies its full line of Bridge Rectifiers, ESD Diodes, High Voltage Rectifiers, Recovery Rectifiers, Schottky Diodes, Signal-Switching Diodes, Silicon Carbide (Sic) Schottky, Standard Rectifiers, Transistors, Transient Voltage Suppressor (TVS) Diodes, Zener Diodes and MOSFETs.
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The TL431 circuit designed to behave as an ideal zener diode.
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UTC Fire & Security, a provider of fire safety and security solutions, has created a joint venture in the UAE with Muneer Ahmad Al-Sheikh Mohammed Sharif Al Olama of Zener Group.
Summary: UTC Fire & Security announced today it has created a joint venture in the United Arab Emirates (UAE) with Muneer Ahmad Al-Sheikh Mohammed Sharif Al Olama of Zener Group.
Institutional investors projected the company's gross profit margin to rise to 21% in the second quarter from 15% it registered in the first quarter this year and estimated the company's earnings from core business in the meantime to grow at least four folds, mostly thanks to increased shipments of the profitable zener diodes.
1, Groups A, B, C and D when used with approved zener barrier systems.