1N4728A,133

Series:	--
Packaging:	Tape & Box (TB)
Part Status:	Active
Voltage - Zener (Nom) (Vz):	3.3V
Tolerance:	±5%
Power - Max:	1W
Impedance (Max) (Zzt):	10 Ohms
Current - Reverse Leakage @ Vr:	100µA @ 1V
Voltage - Forward (Vf) (Max) @ If:	1.2V @ 200mA
Operating Temperature:	-65°C ~ 200°C
Mounting Type:	Through Hole
Package / Case:	DO-204AL, DO-41, Axial
Supplier Device Package:	DO-41
Base Part Number:	1N4728

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Introduction

The 1N4728A is a type of Zener diode, or a diode specifically designed to regulate voltage and help keep constant current from running back to its source. It is a single diode, with a low forward voltage drop and a large reverse breakdown voltage, making it a great choice for many small to medium-sized electronic applications. In this article, we will discuss the various application fields and working principles of the 1N4728A.

Application fields and usage

The 1N4728A is often used in voltage regulating circuits to provide a high level of reverse breakdown voltage. This allows the device to resist static electricity and provide a high level of reverse protection. In addition, the device has a low forward voltage drop and is available in lightning strike protection packages.The 1N4728A is also used as an input and output diode in logic gates and other digital logic applications. It is also ideal for voltage and current regulation, as well as for low-voltage AC voltage detection.The device is also used in automotive applications, such as ECU and engine harness and in-dash circuit protection. It is also used to protect devices from noise and interference from high-frequency signals.The 1N4728A is also used for surge protection in both residential and commercial settings. In addition, it can be used for lightning protection, ESD control and RF protection.

Working principle

At low forward currents, the device behaves as a standard diode, allowing current to flow only in one direction and blocking current in the other. This is known as rectification.As the current increases, however, the 1N4728A exhibits a property known as avalanche breakdown. This is when the electric field at the junction of the diode becomes so large that electrons in the junction start to break down the barrier and the avalanche of electrons causes the device to conduct.The voltage at which this avalanche breakdown occurs is referred to as the “Zener voltage”, and in the case of the 1N4728A, this voltage is specified to be 133V. This means that if the current flowing through the diode is increased beyond this voltage, the diode will start to conduct.

Conclusion

In conclusion, the 1N4728A is a type of Zener diode, with a low forward voltage drop and a large reverse breakdown voltage. It is often used in voltage regulating circuits and has numerous other applications, such as surge protection, lightning protection, ESD control, RF protection and in-dash circuit protection. It works on the principle of avalanche breakdown, where the electric field at the junction of the diode becomes so large that electrons in the junction start to break down the barrier and thus, the diode starts to conduct at a specified Zener voltage.

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