SMBJ78

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TVS - Diodes

A Transient Voltage Suppressor (TVS) Diode is a type of diode designed to protect sensitive electronic circuits from voltage rising spikes. It works on the same principle as a normal diode, but with extreme fast switching speeds to absorb the surge thus protecting the circuit. The TVS diodes, such as SMBJ78, are commonly available as single devices for in-line applications, such as connecting between the power supply line and the device it is protecting. The TVS also comes in a range of dual diodes for differential applications, where two working in pairs is more effective in reducing the voltage of the surge.

The SMBJ78 TVS diode’s main application is to protect systems from Transient Voltage Surge Suppressors (TVSS). It is designed to reduce surges at supply lines and protect sensitive electronic circuits from high utility voltages or connection of foreign sources. It also works to reduce disturbing transients in networks that are connected to sensitive electronic equipment. Besides, SMBJ78 is also suitable for protecting offline switch mode power supplies and low voltage circuits.

SMBJ78’s working principle lies on the ability of the diode to rapidly switch in a reverse direction during a power-surge event. When the voltage exceeds its peak pulse voltage, it conducts a large current (irrespective of the normal forward voltage of the diode), which is around 1,000A depending on the size of the device. This surge current is then conducted to the ground reference and the increased voltage will then be dropped. This is then followed by the stored energy in the parasitic capacitance of the diode to set it up for the next surge episode.

In conclusion, the SMBJ78 TVS Diode is an ideal tool to protect sensitive electronic circuits from voltage rising spikes. It is widely used in many surge suppression applications. With the ability of SMBJ78 to rapidly switch, it reduces disturbing transients and also offers superior clamping response and low leakage current characteristics.

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