1SMA4749TR

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Diodes are semiconductor-based components which are used in a variety of electronic applications. They can be used for simple load or protective functions, or for more complex tasks such as switching or rectification. In this article, we will discuss the application field and working principle of a 1SMA4749TR zener diode.

A zener diode is a two-terminal semiconductor device that allows the electric current to flow in a forward direction and then upon a certain back reverse bias, the current is allowed to flow in the reverse direction. Zener diodes are widely used in electronic circuits as voltage references and as shunt regulators to regulate the voltage across small circuits. Zener diodes are named after Dr. Clarence Zener, who discovered the principle of operation of these special diodes in 1934.

The 1SMA4749TR is a single zener diode commonly used in a range of consumer and industrial electronics. It has a breakdown voltage of 47 volts, which is the voltage below which the diode starts conducting in the reverse direction. The maximum reverse voltage is up to 100V. The device has a glass passivated junction and is housed in a SMA package (5.5 mm x 9.7 mm).

The most common application for the 1SMA4749TR is for overvoltage protection, and it is also used for stabilising or regulating the power supply voltage of an electronic circuit. As the current is conducted in the reverse direction, the voltage is regulated, and the power is stabilized. This is especially useful in a circuit where the power supply needs to be more reliable and the potential for overvoltage needs to be eliminated.

The working principle of the 1SMA4749TR zener diode involves a special type of semiconductor, known as a PN junction, which is created by placing two layers of oppositely-charged material side by side. The PN junction allows a certain amount of current to pass through, known as the forward bias current. This current provides a reference for all other currents passing through the diode.

When the voltage applied to the diode reaches the breakdown voltage threshold, the current begins to increase beyond the established forward bias current, and the diode starts to conduct in the reverse direction, resulting in a stabilised output voltage as electricity is directed from a higher voltage to a lower voltage.

To summarise, the 1SMA4749TR is a single zener diode used for overvoltage protection and to regulate the power supply voltage of an electronic circuit. The diode is composed of a PN junction that allows current to pass through in the forward bias and, when a certain level of voltage is reached, the current flows in the reverse direction. Through this process, the output voltage is not only regulated but also stabilised, making the 1SMA4749TR a highly practical and useful device in a number of different applications.

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