SMBJ5348AE3/TR13

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Diodes - Zener - Single

The SMBJ5348AE3/TR13 is an example of a Zener diode, a type of diode designed to operate in the breakdown region. Zener diodes have a negative temperature coefficient, meaning their resistance decreases with increasing temperature. This behavior makes them ideal for use in voltage regulation and voltage clamping applications, where their ability to maintain a stable voltage with changing temperatures proves invaluable.

The SMBJ5348AE3/TR13 is designed for use in high voltage applications, with a maximum voltage rating of 62 Volts, and a maximum power dissipation of 500 mW. It is ideal for use in AC-DC converters, power distribution systems, and automotive applications. The total capacitance of the SMBJ5348AE3/TR13 is extremely low at around 5 pF, making it suitable for high frequency applications. Finally, it offers excellent surge performance, capable of withstanding 5 kV peak under 8.3μs!

Working Principle

The working principle of a Zener diode can be understood by examining how it operates. When a Zener diode is reverse-biased, meaning that the anode is at a higher voltage than the cathode, a small leakage current will flow through the diode. As the reverse voltage increases, the leakage current will also increase, until a point is reached where the internal resistance suddenly drops and the current sharply increases. This point, known as the breakdown voltage, is the voltage at which the Zener diode will begin to conduct in the reverse direction.

The Zener diode will continue to conduct in the reverse direction as long as the applied voltage is greater than the breakdown voltage. As current flows through the diode in reverse, it creates a voltage drop, allowing it to act as a voltage regulator. This is why Zener diodes are commonly used in applications such as voltage regulators and voltage clamps.

While Zener diodes are ideally suited to voltage regulation and voltage clamping applications, they do have some limitations. Most notably, they can suffer from a phenomenon known as “avalanche breakdown”, where the rapid increase in current can produce high voltages in the diode and cause it to fail. It is important, therefore, to use a Zener diode with a breakdown voltage that is lower than the maximum voltage that the circuit will need to withstand.

In summary, the SMBJ5348AE3/TR13 is a Zener diode designed for use in high voltage applications. With its low capacitance, excellent surge performance, and ability to maintain a stable voltage with changing temperatures, it is ideal for use in AC-DC converters, power distribution systems, and automotive applications.

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