SMBG5369AE3/TR13

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Diodes are very important components in our modern electronics, as they help control the flow of current in a circuit. Among the many types of diodes available, zener diodes are special types of diodes that also allow current flow from only one direction, but are able to withstand very high reverse voltages, making them popular components in surge protectors and other circuits where high voltages might be present. Zener diodes are further classified into single and dual diodes.SMBG5369AE3/TR13 is a single Zener diode, which has a breakdown voltage of 4.7V, a power dissipation of 500 mWatts and a maximum operating temperature of 150C.

The primary application field of an SMBG5369AE3/TR13 single Zener diode is to provide overvoltage protection, mainly for electrical appliances such as TVs, sets-top boxes, computer peripherals and other related appliances. In these applications, excess voltage is often considered a major factor, so by installing the diode, current flowing in the opposite direction to that expected can be eliminated, while the actual working voltage remains within acceptable limits. In the case of short circuit currents, the Zener diode clamps the voltage to its breakdown voltage, ensuring that the appliance remains safe.

In addition, Zener diodes can also be used to help regulate voltage and current in a continuous fashion. This is known as the Zener voltage regulator, which utilises the properties of reverse breakdown of a diode to limit the reverse voltage and help maintain a constant output voltage. By providing a very low-cost solution, this type of regulator can be used in cost-sensitive applications.

The working principle of a SMBG5369AE3/TR13 single Zener diode is relatively straightforward. When a forward bias is applied to the anode and cathode, the free electrons created by this forward bias will combine with the hole in the valence band of the PN junction and create a depletion region, which is essentially a region with no charge carriers. This depletion region helps to stop the flow of current in the reverse direction. If the voltage applied to the diode reaches a certain level (known as the Zener breakdown voltage), the depletion region becomes so thin that additional electrons can easily be pushed across the PN junction, enabling the current to flow in the reverse direction. This causes the diode to breakdown and the current flow is regulated.

In summary, SMBG5369AE3/TR13 single Zener diode can be used for overvoltage protection, as well as for voltage regulation purposes. It has a breakdown voltage of 4.7V, a power dissipation of 500 mWatts and a maximum operating temperature of 150C. By understanding the working principle of the Zener diode, it becomes easier to get the most out of it and deploy it in the most suitable application.

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