VLZ4V7B-GS18

Series:	Automotive, AEC-Q101
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Voltage - Zener (Nom) (Vz):	4.68V
Tolerance:	--
Power - Max:	500mW
Impedance (Max) (Zzt):	25 Ohms
Current - Reverse Leakage @ Vr:	6µA @ 2V
Voltage - Forward (Vf) (Max) @ If:	1.5V @ 200mA
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Surface Mount
Package / Case:	SOD-80 Variant
Supplier Device Package:	SOD-80 QuadroMELF

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Introduction To VLZ4V7B-GS18

The VLZ4V7B-GS18 is a single Zener diode made by Vishay Siliconix. It is a small surface mount package, in a SOD-323 package with a maximum operating temperature of 125°C.

Application Field of VLZ4V7B-GS18

The VLZ4V7B-GS18 can be used in a variety of different applications. It can be used for overvoltage protection in high-side and low-side configurations, for slipping mode power factor correction and for low bias applications. It can also be used for line regeneration and for short circuit protection as well as for clamping in automotive electronics.

Working Principle of VLZ4V7B-GS18

The VLZ4V7B-GS18 works by allowing a controlled amount of current to flow through the device at a specified voltage. This specified voltage is known as the Zener voltage, for example the VLZ4V7B-GS18 has a Zener voltage of 7.5 V. It functions by allowing current to flow through the device in one direction, while preventing any current from flowing in the opposite direction, this is known as reverse bias operation. When the voltage across the diode is less than or equal to the Zener voltage, the diode acts like an open circuit and the voltage will be clamped to the Zener voltage. If the voltage across the diode is greater than the Zener voltage, the diode conducts and the excess voltage will be absorbed by the diode. The VLZ4V7B-GS18 is also sensitive to thermal variations, meaning that its Zener voltage decreases as its temperature increases. This allows the diode to have a lower Zener voltage at high temperatures A typical way to compensate for this is to use a fixed bias on the diode which will shift the breakdown voltage reading up.

Conclusion

The VLZ4V7B-GS18 is a single Zener diode made by Vishay Siliconix. It is a small surface mount package, in a SOD-323 package with a maximum operating temperature of 125°C. It can be used for overvoltage protection in high-side and low-side configurations, for slipping mode power factor correction and for low bias applications. It works by allowing a controlled amount of current to flow in one direction at a specified voltage and by clamping the voltage to the Zener voltage when the voltage across the diode is less than the Zener voltage. The Zener voltage may decrease with temperature, so compensating techniques may need to be implemented.

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