PZU3.9B2L,315

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A Zener diode is a special type of diode used in reverse bias that allows current to flow from its p-region to its n-region. Its primary purpose is to serve as a voltage regulator by allowing a preset voltage to be maintained across it, no matter what voltage is applied to it. The PZU3.9B2L,315 is an example of a single Zener diode. Let’s learn more about its application field and working principle.

Applications

The PZU3.9B2L,315 is a 3.9V Zener diode with a maximum current of 200mA. It is often used in applications requiring a stable voltage supply such as power supplies, automotive electronics, and in test and measurement equipment. It is also used in circuits that require a low-voltage reference, such as voltage regulators and voltage references.

A Zener diode can also be used to provide protection to a circuit against transients, such as those caused by electrostatic discharge (ESD). In this application, a series resistor is installed in the circuit to limit the current when the transient occurs and the Zener diode is connected in parallel to provide a low-impedance path for the current. This allows the transient energy to be dissipated safely, instead of causing damage to the circuit.

Working Principle

The Zener diode operates in reverse bias, meaning that the current flows from the p-region to the n-region. When the voltage applied to the PZU3.9B2L,315 is greater than the device’s breakdown voltage, it enters the breakdown region. In this region, the current increases exponentially with the voltage, thus dissipating the excess energy and regulating the voltage. This is why Zener diodes are often used in power supplies and voltage regulators.

When the voltage applied to the PZU3.9B2L,315 is lower than its breakdown voltage, it behaves like a normal diode, with current only flowing in one direction – from its p-region to its n-region. In this mode, the diode has a very low resistance, allowing it to effectively pass current even at lower voltages.

In summary, the PZU3.9B2L,315 is a single Zener diode used in many applications. It is capable of regulating the voltage in the circuit it is connected to, by allowing a preset voltage to be maintained across it, no matter what voltage is applied to it. It can also be used to protect circuits from transients, by dissipating the excess energy safely.

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