BZG04-20-M3-18

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BZG04-20-M3-18 Diodes - Zener - Single Application Field and Working Principle

The BZG04-20-M3-18 diodes fall under the category of single zener diodes, which offer protection from overvoltage transients, surges and spikes that can be detrimental to both equipment and circuit life. The BZG04-20-M3-18 diodes are designed for general-purpose reverse voltage protection, providing very stable voltage regulation.

A single Zener diode is a semiconductor device that permits the flow of current in one direction only, but when the voltage reaches a certain level, it permits a reverse flow. If the normal voltage exceeds this level, the current will flow through the diode in the opposite direction, degrading to a single diode which clamps the voltage at a preset level. A single Zener diode can be used to provide protection for circuits when the voltage in the circuit is subject to large transients or sudden spikes.

Applications of single Zener diodes include protection from electrical overvoltage transients, especially in communication and computer systems. Zener voltage regulators are frequently used in regulated power supplies to control the output voltage. They protect sensitive electronic devices by providing a relatively constant voltage with decreasing load current.

The basic operation of a single zener diode is quite simple. When the anode is positive (relative to the cathode) and the forward voltage is greater than the breakdown voltage (Vz), the diode behaves as a normal diode and conducts current in the forward direction. When the voltage increases beyond the Vz, the diode turns sharply into the breakdown voltage region known as a Zener breakdown, and the current will increase exponentially. The breakdown voltage remains constant until the current reaches a limiting value beyond which the voltage decreases.

After the breakdown point, a slight reverse bias (negative anode) will cause the diode to conduct reverse current, just like a normal diode. The reverse bias voltage will depend upon the load current and Vz. This process of allowing current to pass in the reverse direction when a reverse bias voltage is applied is called Zener breakdown. The diode can act as a voltage regulator, maintaining the voltage across the load constant.

Zener diodes have a high reverse breakdown voltage and are used to protect portable devices and equipment, consumer electronics, automotive and other applications from overvoltage transients. They have wide range of stability and can be used to create clamping and protective devices like voltage, current and temperature regulators, crowbar and other overvoltage protection devices.

The BZG04-20-M3-18 diode offers the most reliable, cost-effective and dependable way of protecting sensitive electronic components and circuits from overvoltage transients. It is designed for general-purpose reverse-voltage protection and provides excellent voltage regulation. This type of diode is suitable for all sorts of electronics, automotive and other applications, providing a simple, easy-to-install and cost-effective solution for overvoltage protection.

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