CMHZ4678 TR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	1.8V
Tolerance:	±5%
Power - Max:	500mW
Current - Reverse Leakage @ Vr:	7.5µA @ 1V
Voltage - Forward (Vf) (Max) @ If:	1.5V @ 100mA
Operating Temperature:	-65°C ~ 150°C
Mounting Type:	Surface Mount
Package / Case:	SOD-123
Supplier Device Package:	SOD-123

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Introduction

The CMHZ4678 TR is a Zener diode which is designed for working under high power operation and applied for use in various industries. It is suitable for the circuits especially for protecting the device from voltage surge in communications, automotive and motor control applications. The good thermal resistance performance makes the CMHZ4678 TR distinctive from other diodes and has made it the most favoured diode in these application fields. This article will discuss the application field and working principle of the CMHZ4678 TR.

Application Field

The CMHZ4678 TR is a Zener diode which is most applied in communications, automotive and motor control applications. It possesses great reverse breakdown voltage and low dynamic impedance, providing good ESD protection. Furthermore, it is able to suppress the overvoltage without influencing system operations and offers wide temperature range. Due to its exceptional traits, it is the ideal choice for electric vehicles, LED lighting, digital interfaces, and automotive power sensors.

Working Principle

The CMHZ4678 TR operates through the effects of PN junction depletion layer. Voltage across the PN junction increases when the PN depletion layer becomes larger, and the current through it is correspondingly higher. Normally, PN junction depletion layer is affected by the amount of voltage applied to the circuit and the leakage current of the diode and limits the peak reverse voltage of the diode. However, when the PN junction reaches the Zener voltage, the junction degrades and the depletion layer decreases. This reduces the voltage across the junction and the current through it, and consequently the power dissipation increases. At the same time, electrons start to flow along the cross section of the PN junction, which competes with the electron hole movement, producing a negative resistance which allows very large current to flow with little additional voltage. This is the principle of operation of the PN junction diode.

Conclusion

In conclusion, the CMHZ4678 TR is an efficient diode which is an ideal choice for applications such as communications, automotive and motor control systems. The functioning of CMHZ4678 TR is based on the physics of PN junction depletion layer. It is very effective in suppressing the overvoltage and protecting the device from damage. Therefore, the CMHZ4678 TR is a must for applications like electric vehicles, LED lighting, digital interfaces and automotive power sensors.

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