SMBJ78A

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The SMBJ78A is a component used in the field of TVS diodes, and it specifically works as a voltage suppressor. It functions to limit peak voltage spikes to safe levels so as to protect components in the circuit, including driver components. In addition to providing overvoltage protection, SMBJ78A also prevents reverse-polarity current from flowing back into a power source. It is typically considered a standard transient voltage suppressor because it is designed mostly for commercial grade applications, which are often subjected to higher levels of power spikes.

The SMBJ78A has a peak pulse power rating of 1500W and a peak clamping voltage of 78V. It has a low capacitance of 0.3pF per line, making it an ideal choice for applications requiring low leakage too. The device comes in a conventional DO-214AA (SMF) package that has a very standard footprint and size.

The working principle of the SMBJ78A is focused on providing overvoltage protection. It contains multiple components, such as zener diodes, varistors, and other components. When a circuit is powered up, there is a sharp rise in the power voltage, which causes the zener diode inside the SMBJ78A to break over due to its low leakage. At this point, the SMBJ78A starts clamping the voltage to a predetermined level, which is safe for all the components connected to the circuit, and the excess power is dissipated away as heat. This process continues until the surge has been completely dissipated, at which point the circuit returns to its normal operating voltage.

The SMBJ78A is a perfect choice for sensitive circuits that are vulnerable to relatively high levels of spikes and surges. It uses minimal capacitance and is capable of dissipating large amounts of power without getting damaged. In addition to being used as an overvoltage protection device, it can also be used to protect equipment from damage due to lightning strikes. If used properly, the SMBJ78A can provide reliable protection against surges, spikes, and other power anomalies for years.

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