PZU20BL,315

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	20V
Tolerance:	±5%
Power - Max:	250mW
Impedance (Max) (Zzt):	20 Ohms
Current - Reverse Leakage @ Vr:	50nA @ 15V
Voltage - Forward (Vf) (Max) @ If:	1.1V @ 100mA
Operating Temperature:	-55°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	SOD-882
Supplier Device Package:	DFN1006-2
Base Part Number:	PZU20

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Introduction

Diodes are among the most basic electronic components and are commonly used in a wide variety of applications, from rectifying power supplies to controlling the flow of current in a circuit. Zener diodes, named after their inventor, Clarence Zener, are a type of diode that, unlike normal diodes, can conduct current in either direction. Unlike regular diodes, Zener diodes are designed to breakdown at a specific reverse bias voltage and begin to conduct current in the opposite direction. The PZU20BL,315 is a single Zener diode with a breakdown voltage of 20V and a maximum power rating of 315mW. This article will discuss the application field of the diode and its working principle.

Application Field

The PZU20BL,315 Zener diode is mainly used in voltage regulation and current limiting applications. Zener diodes are used to regulate the output voltage of power supplies by clamping the voltage to its breakdown voltage. When the voltage reaches the breakdown voltage, the current begins to flow in the opposite direction, creating a voltage drop across the diode which limits the output voltage. The PZU20BL,315 can also be used to limit the current flowing through a circuit. When the current flowing through the diode reaches the maximum power rating of 315mW, the diode will begin to conduct current in the opposite direction, creating a voltage drop across the diode and preventing the circuit from drawing more current. The PZU20BL,315 is also commonly used in transient suppression applications. When a sudden surge of electric energy passes through the diode, the diode’s breakdown voltage will be overwhelmed and the current will be diverted through the reverse biased Zener diode, preventing the surge from damaging other components.

Working Principle

The working principle of the PZU20BL,315 is based on the Zener effect. The Zener effect is a phenomenon that occurs when an electric current passes through a diode in the reverse direction, creating an electric field that is strong enough to force free electrons across the junction between the P and N regions of the diode, which allows the diode to conduct current in the reverse direction. When the Zener diode is hooked up to a power source and current begins to flow, the current will flow in the same direction as the electric field. However, once the electric field reaches a certain intensity, the electric field will become strong enough to force the electrons across the junction, creating a reverse bias. This reverse bias will cause the diode to start conducting current in the opposite direction. The current can then be regulated by adjusting the voltage of the power source. At the breakdown voltage of 20V, the PZU20BL,315 Zener diode will begin to conduct current in the opposite direction and the voltage will be limited to the breakdown voltage. The voltage regulation of the diode can be further adjusted by adjusting the current flowing through the diode. By connecting the diode in reverse bias, the PZU20BL,315 diode can also be used to limit the current flowing through a circuit. When the current reaches the maximum power rating of 315mW, the diode will begin to conduct current in the opposite direction and the voltage across the diode will drop, preventing the circuit from drawing more current.

Conclusion

The PZU20BL,315 is a single Zener diode with a breakdown voltage of 20V and a maximum power rating of 315mW. It is mainly used in voltage regulation and current limiting applications, as well as transient suppression applications. The working principle of the diode is based on the Zener effect, which indicates that when an electric current passes through a diode in the reverse direction, it will create an electric field that can force the electrons across the junction, allowing the diode to conduct current in the opposite direction.

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