SMAJ48CAHE3/5A

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TVS (Transient Voltage Suppressors) are designed to protect sensitive electronics from voltage surges and spikes. They are an especially common component in modern electronics, as they help protect against electrostatic discharge, over-voltage and power surges. The SMAJ48CAHE3/5A is a fairly standard type of TVS diode, and its application field and working principle can be understood by looking at the key components that make up this type of technology.

Introduction

TVS diodes, like the SMAJ48CAHE3/5A, are made up of two main components, a LED (light emitting diode) and a Zener diode. The LED is basically a regular diode with a built-in resistor, and is used to provide a current-limiting resistor within the circuit. On the other hand, the Zener diode is an additional type of diode with a built-in breakdown voltage, meaning it can limit the voltage across the diode to a certain level. Together, these two components help regulate and protect voltage levels.

Application Field

The SMAJ48CAHE3/5A TVS diode is designed for protecting both AC and DC power supply lines in a variety of different applications. Specifically, this diode can be used on lines with +24V/ -24V DC as well as +2V/ -2V AC input. By protecting the power supply lines, these diodes can ensure that any sudden voltage spike or over-voltage will be caught and dissipated by the diode, thus protecting the connected devices from damage.

The SMAJ48CAHE3/5A also finds applications in automotive electronics. It is a common choice for protecting automotive infotainment systems and other sensitive electronics from voltage surges. Since these systems are often subjected to a variety of harsh environments, such as high temperatures or stifling humidity, the SMAJ48CAHE3/5A provides a reliable way of protecting sensitive components from electrostatic discharge, power surges, and reverse voltages.

Working Principle

The actual workings of the SMAJ48CAHE3/5A follow the same principles that other TVS diodes do. The LED in the diode is designed to limit the current flow and will only conduct in one direction, from anode to cathode. The Zener diode, on the other hand, is designed to limit the voltage across the diode to a specific level. When a power surge or over-voltage reaches the diode, the current is limited and the voltage is restricted, thus avoiding any damage to the connected components.

However, since the SMAJ48CAHE3/5A is designed to protect against reverse voltage, it does not work the same way as a regular diode. Rather, when there is a reverse voltage, the LED will become a short circuit and allow the voltage to be dissipated quickly, protecting the connected components from damage.

Conclusion

In conclusion, the SMAJ48CAHE3/5A is a fairly typical type of TVS diode. It is designed to provide protection to power supply lines, as well as automotive infotainment systems, from voltage surges and spikes. The diode works by limiting the current flow and restricting the voltage across the diode to a certain level, thus providing reliable protection in even the most extreme environments.

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