1N4747A-TR

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Zener diode is actually a kind of general PN junction diode, acting as a normal diode under the forward conditions, and acting as an adjustable voltage regulator under the reverse conduction though which make the PN junction saturation. The Zener diode is formed under current bombardment and the N-type impurity is highly promoted to close the equilibrium junction area. The application field of the 1N4747A-TR is in the industry and other areas.

Working Principle

An 1N4747A-TR Zener diode works as an adjustable voltage regulator. When working at a fixed reverse polarity, its reverse break-down voltage does not change too much with the change in the current which flows through the diode. In this way, the diode works as a volatge regulator. That is to say, when the change in the input voltage exceeds a certain value, the voltage across the diode turns to a certain stable value that lines up the total voltage which is the sum of the input voltage and the voltage across the diode. In this way, the output voltage will not fluctuate by a large margin.

Under the reverse electric field, that is, when the PN junction is reverse biased, electric diffusion field is came into being. At the same time, the depletion region will also be extended. Once the electric field reaches to the level of the Zener breakdown voltage, strong electric current will conduct createdness minority carriers in the depletion region and make them transform into majority carriers. Thus, a kind of avalanche effect phenomenon is generated.

When the avalanche effect takes place, a large number of electric holes will be injected from the P region to the N region and the electrons from the N region to the P region. As a result, a large current will take place, but contrary to this, the electric capacity of the PN junction is limited, leading to a high potential difference with a voltage that nears to Zener Breakdown Voltage.

For a given Zener Breakdown Voltage, the reverse current of the Zener diode decreases as the non-isolated resistance decreases. This non-isolated resistance is in fact the junction resistance of the PN junction. As such, it can be said that Zener diode operates in a kind of feedback control system. In other words, the voltage stability of the Zener diode is maintained by adjusting the conduction current.

Application Field

1N4747A-TR Zener diode has wide application range in the industry and other multiple areas. It can be used in constant current source, such as lighting and LED. Meanwhile, stabilizing voltage voltage source, such as video power supply, switchers are also applicable. Besides, it can also be applicable for the protection of LCD, dust removing device and surge machine.

In industry, 1N4747A-TR Zener diode is mainly used in multiple electronic detectors, voltage regulators, power switches and current limiting circuit. The diodes are also used in aircraft, tanks and other military defense units. Since the zener diodes possess significant characteristics to provide with higher power of voltage and low thermal resistance, they are necessary function components in such machines and equipment.

Other possible areas include AC. DC circuits which adopt the function of voltage stabilizing components, voltage reference elements, oscillator circuits and amplifying circuits. In these areas, all needs a reliable and stable regulating voltage or current supply from a primary energy source. The shunt regulator diodes can be applicable for both voltage regulating and current limiting purposes.

Conclusion

1N4747A-TR Zener diodes are mainly used in the areas such as constant current source, voltage source, detectors, and AC & DC circuit devices. Their wide application fields make them suitable and irreplaceable in multiple devices and infrastructures, with key ability of voltage stabilization and current limiting. With the superior performance of voltage and current, the zener diodes can provide more reliable, stable and efficient voltage and current supply.

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