SMBJ78CA-13-F

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TVS - Diodes

TVS (Transient Voltage Suppressor) diodes, also called as avalanche breakdown diode, are widely used in electronic circuits for protection against voltage fluctuations and surges. The SMBJ78CA-13-F is one such device which is commonly used for this purpose in automotive, industrial and consumer electronic applications. This article will cover the application field and working principle of the SMBJ78CA-13-F device.

Application Field

The SMBJ78CA-13-F is a bidirectional device, which makes it suitable for protection of circuits connected in both directions. It is especially useful in protecting against protection against transient overvoltages (such as electrostatic discharges) and for protection of high voltage spikes. The device can be used in a variety of applications where transient overvoltages and surges of short duration need to be suppressed, such as automobiles, industrial equipment, communication equipment, medical equipment, consumer electronics, etc.

Working Principle

The principle of operation of the SMBJ78CA-13-F is based on the breakdown voltage primarily. It is a Zener diode, which means that it is characterized by a breakdown voltage VBR. When the voltage across the device exceeds the VBR, the diode will start to conduct and will absorb the excess energy in the form of heat. During this process, the current through the device can reach several tens of amps. This current is then limited by the internal resistance of the device. The device is able to handle transient overvoltages of up to 1300 V.

The device also contains a varistor, which provides a low-resistance path when the voltage exceeds the breakdown voltage. This low-resistance path will limit the peak current through the device, thereby providing additional protection against damaging transients.

In addition, the SMBJ78CA-13-F also contains a thermal fuse, which is designed to open in the event of excessive current or excessive temperature. This is an important feature as it ensures that the device does not become permanently damaged in the event of an overvoltage

Conclusion

The SMBJ78CA-13-F is a powerful transient voltage suppressor diode with a breakdown voltage of 1300 V and excellent transient protection capabilities. It is suitable for applications where short duration surges and overvoltages need to be suppressed, such as automobiles, industrial equipment, communication equipment, medical equipment, consumer electronics, etc. The device also includes a varistor and a thermal fuse, which ensures additional protection against damaging transients and excessive current.

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