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Introduction to the SMBJ20A-TR Application Field and Working Principle

The SMBJ20A-TR is a type of Transient Voltage Suppressor (TVS) diode that is designed to protect against voltage changes and spikes in electronic circuits. It is best used for applications where overvoltage protection or voltage clamping is needed, such as in general automotive and consumer electronics. This diode is relatively small compared to other traditionally used TVS diodes, making it ideal for use in compact circuits.

TVS - Diodes

TVS diodes are a form of surge protection devices that work by reducing overvoltage. They are frequently used in automotive circuits, home electronics, industrial circuits, and mobile device circuits, as they protect circuits against power surges, noise, and ESD (electrostatic discharge) surges. TVS diodes have the following advantages when compared to other surge protection devices:

• They can provide instantaneous protection against voltage surges.
• They dissipate a minimal amount of energy, making them more efficient.
• They offer low capacitance and low response time.
• They are relatively small, allowing them to be used in compact circuits.

SMBJ20A-TR Overview

The SMBJ20A-TR is a type of unidirectional TVS diode specifically designed to protect circuits from voltage and current surges. It is designed to support automotive, consumer, industrial and audio applications by providing an effective surge/spike protection. It is a part of the SMBJ AEC-Q101 compliant product family. The rated voltage of the SMBJ20A-TR is 20V, and it can absorb up to 2A of surge current.

The SMBJ20A-TR has mechanisms in place to protect circuits against reverse and in-circuit overvoltage conditions. It also has a dust and moisture resistance rating of 1, meaning it can be used in environments with high levels of dirt and humidity. The maximum leakage current through the diode is 5μA at 25°C.

SMBJ20A-TR Working Principle

As a unidirectional diode, the SMBJ20A-TR is designed to only allow current to flow through it in one direction. When the voltage reaches a certain level, the diode kicks in and starts to conduct current through it. This effectively limits the voltage of the circuit to the diode\'s breakdown voltage, thus protecting the circuit from damaging overvoltage.

When the voltage exceeds the specified breakdown level, the diode conducts current and limits the voltage to the specified breakdown voltage. This prevents the voltage from exceeding the breakdown voltage by dissipating the excess current as heat. The excess current is then dissipated to the ground of the circuit. This all happens extremely quickly - as fast as 5ns.

Conclusion

The SMBJ20A-TR is an ideal choice for overvoltage protection in automotive, consumer, and industrial applications. It is designed to handle up to 2A of surge current, and its small size makes it ideal for compact circuits. The SMBJ20A-TR works by conducting current when it senses a voltage spike, thus limiting the voltage to its breakdown value and protecting the circuit from damage.

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