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Diodes - Zener - Single

The SMBJ4747C/TR13 is a fast-switching small Signal Diode with a 400mW power rating. Its ability to absorb high surge current makes it the ideal choice for several applications where it is subject to overvoltage conditions. It has a maximum break-over voltage at 6.8V and 45V maximum peak pulse with a peak surge of 1500W and a reverse leakage current of 250nA.

Application Field of SMBJ4747C/TR13

The SMBJ4747C/TR13 has an impressive 600 V low-capacitance voltage rating, even at maximum current and temperature. Therefore, it is suited to a wide range of applications including lighting, consumer electronics, PV systems, and automotive electronics, among others. Additionally, it can help improve the reliability and safety of home appliances, four-wire systems, and industrial electronic elements.

Working Principle of SMBJ4747C/TR13

The SMBJ4747C/TR13 works on the principle of a Zener Diode. When reverse biased, it shows a constant breakdown voltage operation and also functions as an overvoltage protection diode with an open-circuit voltage of 6.8V. In addition, it helps to protect against latching and arc-ing caused by high peak pulses. However, at high voltages, it starts to conduct in short and long axis directions. But the current limiting reverse characteristics of the SMBJ4747C/TR13 helps to reduce the generated overvoltage.

The variable resistance nature of the SMBJ4747C/TR13 is also one of its essential characteristics. This helps to absorb high voltage spikes of up to 27V. Most Zener or avalanche diodes lack this variable-resistance capability and cannot absorb such significant energy levels.

Conclusion

The SMBJ4747C/TR13 is a robust and reliable fast-switching small-signal diode with a wide range of applications. It offers enhanced protection against latching and arc-ing due to high peak pulses, as well as variable resistance to absorb high voltage spikes. For these reasons, it is a useful component for consumer electronics, home appliances, and industrial applications.

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