JAN1N4479D

Series:	Military, MIL-PRF-19500/406
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	39V
Tolerance:	±1%
Power - Max:	1.5W
Impedance (Max) (Zzt):	30 Ohms
Current - Reverse Leakage @ Vr:	50nA @ 31.2V
Voltage - Forward (Vf) (Max) @ If:	1V @ 200mA
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Through Hole
Package / Case:	DO-204AL, DO-41, Axial
Supplier Device Package:	DO-41

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JAN1N4479D Application Field and Working Principle

Introduction

The JAN1N4479D is a single Zener Diode which can be used to protect electronics devices and circuits by providing a controlled form of electrical conductivity. It is essentially a low-saturation voltage diode with an anode to cathode breakdown voltage of 0.8V. It is available in a surface mount package and is constructed of silicon and glass.

Application

The JAN1N4479D can be used in a variety of applications such as protecting circuits from over-voltage and over-current, noise suppression, and voltage regulation. It is particularly useful in applications where a precise voltage is required, such as regulating an LED driver, where it will prevent it from receiving too much voltage and overloading. In this application, the Zener Diode is connected in reverse between the LED driver and the voltage source, and will effectively limit the voltage to the precise level required for optimal performance of the LED driver.The device can also be used for managing the output of a power supply, such as in a DC-DC converter. It can be used to better control the output voltage and current, and provide a more reliable and efficient power supply.The JAN1N4479D is also useful in suppressing noise and protecting circuits from ESD (electro-static discharge).

Features and Benefits

The JAN1N4479D is a high quality and reliable device, offering several advantages over other Diode technologies. It is available in a compact package, meaning it is smaller and easier to install on a PCB. It also has a low forward voltage drop and low capacitance, which make it ideal for applications where both voltage and current regulation is required. It has a high temperature coefficient of anode voltage, which makes it more resistant to temperature variations.

Working Principle

The JAN1N4479D is essentially a semiconductor diode designed to limit the reverse voltage of a circuit by providing a controlled electrical conductivity. It works by allowing a reverse current to flow when the voltage across the Zener diode reaches a predetermined level. At this voltage, the diode is essentially reversed biased and the electric current will increase exponentially until it reaches the Zener voltage. This results in a stable and precise voltage limit for the circuit, which is known as the Zener voltage.When the voltage across the diode is below the Zener voltage, the device acts as an open circuit and no electric current is passed. This helps protect the circuit in case of an over-voltage.

Conclusion

The JAN1N4479D is a single Zener diode which is ideal for use in applications where both reliable voltage and current regulation is required. It is particularly useful for protecting circuits from over-voltage and over-current, noise suppression, and voltage regulation. It is available in a surface mount package, and has several features which make it an attractive option for many applications.

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