JANTX1N4979D

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JANTX1N4979D Diodes - Zener - Single

The JANTX1N4979D is a single Zener diode with a CASE (SOD-323) package, capable of removing power surges from electrical circuits and providing safe, reliable voltage regulation. It has a maximum power dissipation rating of 350 mW and a Pdiss tolerance of -375/+400. It has a nominal breakdown voltage of 6.2V with a tolerance range of ±0.4 volts. Additionally, it has a low reverse leakage current of maximum 2 μA.

The JANTX1N4979D is closely related to the JANTX1N4980D, which is also a single Zener diode with a CASE (SOD-323) package. However, the 4980D has a slightly different breakdown voltage of 5.1V and a much higher tolerance range of ±0.5 volts.

Application Field

The primary application fields for the JANTX1N4979D include automotive electronics, digital logic circuits, power electronics, audio and video equipment, communication equipment, and computer and peripheral systems. Its ability to regulate voltage in short bursts and handle high surge currents makes it suitable for use in applications such as overvoltage protection, polarity protection and lightning protection.

The JANTX1N4979D is primarily used for two specific applications. It can be used as a voltage regulator in circuits, either linear or switched-mode. It can also be used as an over-voltage protection device, as its breakdown voltage is 6.2 volts with a tolerance range of ±0.4 volts.

Working Principle

The JANTX1N4979D works by using the low resistance of its PN junction to reduce a voltage change, typically referred to as a ‘clamp’. As the voltage rises above the breakdown voltage, the current through the diode will increase exponentially, thereby limiting the voltage to this fixed point. This clamping effect allows the diode to act like a surge suppressor.

The JANTX1N4979D also acts as a voltage regulator. This is achieved by passing an initial current of opposite polarity through the device. When the voltage drops below the breakdown voltage, the device will begin to limit the voltage drop. This is achieved through the diode’s low forward voltage drop, which serves to maintain a stable output voltage independent of input voltage fluctuations.

The JANTX1N4979D provides protection from overvoltage conditions by keeping the voltage level below the specified breakdown voltage. It also prevents reverse current flow, resulting in improved efficiency and lower power losses. Additionally, this diode can be used to protect circuits from transient spikes and spikes caused by switching related loads.

In summary, the JANTX1N4979D is a single Zener diode with a CASE (SOD-323) package capable of removing power surges from electrical circuits and providing safe, reliable voltage regulation. It can be used as a voltage regulator in both linear and switched-mode circuits, as well as an over-voltage protection device. It also provides protection from overvoltage conditions, making it well suited for automotive electronics, digital logic circuits, power electronics, audio and video equipment, communication equipment, and computer and peripheral systems.

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