PZU33B,115

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	33V
Tolerance:	±5%
Power - Max:	310mW
Impedance (Max) (Zzt):	40 Ohms
Current - Reverse Leakage @ Vr:	50nA @ 25V
Voltage - Forward (Vf) (Max) @ If:	1.1V @ 100mA
Operating Temperature:	-65°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	SC-90, SOD-323F
Supplier Device Package:	SOD-323F
Base Part Number:	PZU33

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PZU33B,115: Application Field and Working Principle of Single Zener Diode

A single zener diode, such as the PZU33B,115, is a semiconductor device with unique characteristics – and therefore many applications – that make it an essential component in many types of circuits. It provides protection from overvoltage, stabilizes an alternating current, and buffers amplifier current. This article will dive into the application field and working principle of zener diodes, in depth, with a focus on the PZU33B,115.

PZU33B,115 Overview

The PZU33B,115 is a special type of single zener diode known as a silicone-based diode, with a reverse breakdown voltage of 33 volts. It has a power dissipation of 500 mW, and a temperature coefficient of -2.0 mV/K. This diode can handle a maximum peak reverse power of 2.5 W, with a maximum forward current of 200 mA.

Application Field of Single Zener Diode

Single zener diodes, such as the PZU33B,115, are used in many different types of applications due to their unique properties. They are commonly used in configurations such as voltage regulators, voltage pump circuits, impedance transformers, peak limiters, and transient suppressors. These diodes are also used in power rectifiers, transistors, and thyristors.In voltage regulator circuits, the purpose of the diode is to act as a reference voltage, the voltage across which does not change. When the voltage from the circuit exceeds the breakdown voltage and current starts to flow, the power dissipated by the diode prevents any further increase in voltage. This ensures that the voltage of the circuit remains constant, allowing the circuit to remain stable and reliable.In peak limiters, the PZU33B,115 diode is used to limit the peak-to-peak voltage of a signal. This ensures that the peak voltage does not exceed the breakdown voltage of the zener diode, preventing excessive current flow in the circuit.The PZU33B,115 can also used in impedance transformer circuits, which convert an AC voltage into a DC voltage. When the AC voltage applied to the diode is greater than the breakdown voltage, the diode will clamp the voltage level, and prevent it from increasing any further. This allows the diode to act as an impedance transformer, and convert an AC voltage into a DC voltage.

Working Principle of Single Zener Diode

A single zener diode, such as the PZU33B,115, works by utilizing the unique properties of a special type of silicon crystal known as a “zener crystal”. This crystal generates a reverse breakdown voltage, the voltage across which does not change when a small amount of current flows through it. This characteristic of the diode is known as “zener breakdown”.The voltage across the diode can be calculated using the following formula: V=Vz + Ivr; where Vz is the zener breakdown voltage, I is the current through the diode, and r is the dynamic resistance of the zener crystal. This formula expresses the relationship between the zener breakdown voltage, and the applied voltage.When the voltage across the PZU33B,115 exceeds its breakdown voltage of 33 volts, it will begin to conduct a small amount of current, and dissipate power. This power will be dissipated as heat, preventing the voltage from increasing any further. This ensures that the voltage across the diode does not exceed the breakdown voltage.

Conclusion

The PZU33B,115 single zener diode has many applications due to its unique properties, such as voltage regulation, peak limiting, and impedance transformation. Its working principle is based on the properties of the zener crystal, which generates a reverse breakdown voltage that is constant, no matter how much current flows through the diode.

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