GLL4757-E3/97

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Diodes - Zener - Single

A Zener diode is a special type of semiconductor diode, designed for use in voltage regulator circuits. Zener diodes, also called breakdown diodes, are specifically designed to operate in reverse breakdown at specified voltages, allowing currents to flow in reverse direction without significant reduction in applied voltage. GLL4757-E3/97 is a single Zener diode.

Operating Principle

Zener diodes operate on the principle of a reverse avalanche breakdown. A voltage is applied across the junction in the reverse direction, and as the voltage rises to the Zener voltage of the device, a large number of electrons and holes are accelerated by the electric field, leading to a large accelerated detachment and a sudden release of charge carriers, creating a large current flow. This sudden increase in reverse current is referred to as “Zener breakdown”.

Applications

Zener diodes have a wide variety of applications in electronic circuits, especially in the field of voltage regulation. When used in a voltage regulator, an input voltage is applied to the Zener diode, limited by a current-limiting resistor. The voltage drop across the diode remains constant across the range of load current variations. This helps to maintain a constant output voltage, hence stabilizing the power supply.

Zener diodes are also used in some voltage multiplier circuits, such as Cockcroft-Walton multipliers, to establish precise voltages. They are also used in some feedback circuits to maintain stable voltage levels. Other applications include signal isolation and signal clipping.

GLL4757-E3/97 is a single Zener diode designed to stabilize and regulate voltages in various electronic circuits. It has an operating between 0.3V to 70V, a power dissipation rating of 500mW, and a peak repetitive reverse voltage of 75V.

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