1N8151 Circuit Protection

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1N8151 - TVS Diodes

TVS or Transient Voltage Suppression Diodes are specifically designed to protect electrical circuits and components from over-voltage and destructive voltage transients. The 1N8151 is one of the more popular and reliable devices in this category, used for preventing permanent or huge fluctuations in a power supply from disrupting equipment in any system. This article takes a look at the application field and working principles of this diode.

Introduction

The 1N8151 diode, as previously mentioned, is intended to protect electrical and electronic equipment from damage due to electrical transients. This diode is a unidirectional component, meaning the current only passes in one direction – from anode to cathode. The 1N8151 is typically marked with a silver stripe for the cathode lead, which identifies the polarity of the device.

Application Field

The 1N8151 is typically used in protective circuits where it is employed as a reversal voltage clamping element. The major application fields are motor controls, power supplies, computers, telecommunications, industrial equipment, and consumer electronics. Typical places where the 1N8151 can be effectively used are rocker switches, power lines (to suppress surges and inductive Flyback voltage), and other industrial equipment.

Working Principle

The working principle of the 1N8151 diode involves the utilization of a zener breakdown in junction with a fast PNPN (positive negative positive negative) switching action. When an input current is applied to the device, the fast switching of the device causes a voltage spike that is clamped at a desired safe level that is determined by the characteristics of the device. The voltage remains clamped until the input current is completely dissipated.

The zener breakdown mechanism helps protect the underlying circuit from overvoltage and thus, helps protect from unintended voltage transients. This working principle is applicable in devices that must stop large surges on power lines or other similar devices. The 1N8151 is designed to absorb and dissipate up to 240 watts of power and this makes it mostly suitable for use with large electrical transients.

Summary

The 1N8151 is one of the more popular and reliable TVS or Transient Voltage Suppression Diodes used for preventing permanent or huge fluctuations in a power supply from disrupting equipment in any system. It is typically used in motor controls, power supplies, computers, telecommunications, industrial equipment, and consumer electronics. The working principle of the 1N8151 diode involves the utilization of a zener breakdown in junction with a fast PNPN switching action. This helps protect the underlying circuit from overvoltage and thus, helps protect from unintended voltage transients.

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