JAN1N4974CUS

Series:	Military, MIL-PRF-19500/356
Packaging:	Bulk
Part Status:	Active
Voltage - Zener (Nom) (Vz):	47V
Tolerance:	±2%
Power - Max:	5W
Impedance (Max) (Zzt):	25 Ohms
Current - Reverse Leakage @ Vr:	2µA @ 35.8V
Voltage - Forward (Vf) (Max) @ If:	1.5V @ 1A
Operating Temperature:	-65°C ~ 175°C
Mounting Type:	Surface Mount
Package / Case:	E-MELF
Supplier Device Package:	D-5B

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JAN1N4974CUS application field and working principle

Applications

JAN1N4974CUS is a Zener diode designed for use in a variety of applications. It is manufacturer rated for reverse breakdown voltages of 7.4 volts and works as a highly stable and reliable voltage reference diode. Its main application is that it can be used as a voltage reference source for biasing circuits, and it is mostly used in voltage regulation, current limiter, surge protector, wave rectifier, and so on.JAN1N4974CUS diodes are used in many consumer devices such as computers and mobile phones. They are also frequently used in industrial and medical equipment. Some of the benefits of using JAN1N4974CUS diodes include their small size, low power consumption, and fast switching characteristics.

Working Principle

The JAN1N4974CUS diode works on similar principles as other Zener diodes. Reverse leakage current is caused by the Zener effect, which is the when current passes through a diode in the reverse direction. Zener diodes are designed to be specifically stable at a certain breakdown voltage, which the JAN1N4974CUS has been specified at 7.4 volts.When current passes through the diode in the forward direction, electrons flow from the anode to the cathode, like in any other diode. However, when a reverse voltage is applied to the terminals such that the electron depletion region expands, a small current begins to flow due to "tunneling". This reverse current does not increase with an increase in voltage, as it does in a regular diode, but the JAN1N4974CUS remains stable up to its breakdown voltage.When the voltage reaches the Zener breakdown voltage, the current through the device increases sharply. This voltage-dependent current squeeze is stabilized at the breakdown voltage, allowing a highly stable and reliable voltage reference to be created.The JAN1N4974CUS has an intrinsic voltage regulator which can hold the output voltage constant. It can provide a stable voltage for devices that require a constant operating voltage over a range of conditions. For example, if a system requires a 12V input to operate and the input voltage fluctuates over time, the diode can help keep the output voltage constant by absorbing the excess current. This can prevent the system from being damaged by overvoltage or undervoltage conditions.

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