BZD27B12P-HE3-08

Series:	Automotive, AEC-Q101, BZD27B
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	12V
Tolerance:	--
Power - Max:	800mW
Impedance (Max) (Zzt):	7 Ohms
Current - Reverse Leakage @ Vr:	3µA @ 9.1V
Voltage - Forward (Vf) (Max) @ If:	1.2V @ 200mA
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Surface Mount
Package / Case:	DO-219AB
Supplier Device Package:	DO-219AB (SMF)

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Introduction

The BZD27B12P-HE3-08 is a single Zener diode commonly used in electronic circuits, typically for protection against transients. It is designed to automatically regulate voltage and protect connected components against damaging voltage spikes. Zener diodes protect sensitive electronics from various environmental conditions and help protect other components that form part of the same circuit. The BZD27B12P-HE3-08 is a popular choice among electronic engineers and DIY enthusiasts due to its low cost and high performance.

Application Field and Working Principle

The most common applications of the BZD27B12P-HE3-08 are over-voltage protection, regulation and stabilisation, reverse power protection and reverse breakdown protection. Zener diodes conduct electricity in one direction only; as the voltage increases, the diode starts to conduct current at a pre-determined voltage level. This is known as the reverse breakdown voltage and determines the useful applications for the diode. In the case of the BZD27B12P-HE3-08, the reverse breakdown voltage is 12V.The working principle of the BZD27B12P-HE3-08 is relatively simple. When the transistor is connected to a power source, current will flow through it in one direction, which is known as the forward bias condition. As the applied voltage increases up to the breakdown voltage, current will start to flow in the opposite direction, known as the reverse bias condition. This process is reversible, meaning that the diode can continue to protect against voltage spikes.The BZD27B12P-HE3-08 can be used in many other applications such as flyback diodes and surge suppression. A flyback diode protects a transistor from high-voltage spikes resulting from inductive loads. This is done by creating a low resistance path for the current to flow, allowing the inductive loads to dissipate energy by shorting out the voltage spike. The surge suppression application is similar but it comes with an added function of dissipating surge energy in a series of electrical flashes.

Conclusion

The BZD27B12P-HE3-08 is a single Zener diode designed to protect against over-voltage and transient excursions. Its main application is as an over-voltage protection device, where it is used to regulate and stabilise the output voltage of a circuit. It can also be used in applications such as flyback diodes and surge protection. It is a cost-effective option for many electronics projects and is popular among DIY enthusiasts.

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