PDZ8.2BF

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Diodes are electrical components used to direct current in an electrical circuit, and Zener diodes are designed for use in reverse bias and provides a constant, non-varying voltage. Single Zener diodes are among the lowest-cost voltage-regulating diodes, and among the most popular is the PDZ8.2BF. In this article we will look at the application and working principles of this component.

Applications

The PDZ8.2BF is a low-power Zener diode, particularly suited for use in electronic products like TVs and other consumer electronics, communications equipment and industrial equipment. This diode can be used to regulate voltage. For example, it can be used in power supplies where it can remain conducting in the reverse direction and can provide an output with a constant voltage, regardless of the load or input voltage. It is also useful for protecting integrated circuits and other components from varying voltage levels.

Working Principle

The PDZ8.2BF is a single Zener diode. It is designed such that, when a voltage is applied in reverse bias, current begins to flow through the diode and a regulated voltage is generated. This is explained as follows.

When the voltage applied across a normal p-n junction diode is reversed, current does not flow through the diode. However, when the breakdown voltage of a Zener diode is reached, current will start flowing, even though the voltage is still in reverse bias. This is known as ‘Zener Breakdown’. It occurs when the electric field of the diode is high enough to cause electrons to tunnel through the depletion layer, thus allowing current to flow.

When the voltage across the diode rises above a certain level, the current starts to increase exponentially. This is due to electron-hole pairs being created in the depletion layer. As these electron-hole pairs are swept across the junction, they create a channel in the depletion layer, allowing current to flow. The voltage at which this occurs is called the breakdown voltage of the diode.

Once the voltage applied across the diode exceeds the breakdown voltage, the current through the diode begins to increase exponentially, resulting in the generation of a constant, non-varying voltage. This is the principle behind the PDZ8.2BF.

Conclusion

The PDZ8.2BF is a single Zener diode, designed for use in reverse bias. It is used mostly in power supplies and other electronic equipment, where it provides a constant, non-varying voltage, regardless of the load or input voltage. It works on the principle of ‘Zener Breakdown’ – when the voltage applied across the diode exceeds the breakdown voltage, the current through the diode starts to increase exponentially, resulting in the generation of a constant voltage.

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