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TVS - Diodes

TVS or transient voltage suppressor diodes are an essential component in protecting devices from sudden electrical events. The SA170A-E3/73 is a diode designed specifically for this purpose, and is used in a variety of contexts ranging from industrial to automotive applications. This article will take an in-depth look at the SA170A-E3/73\'s application field and working principle.

Applications of the SA170A-E3/73

The principal use of the SA170A-E3/73 diode is as a component in overvoltage protection circuits. It is a preferred choice for protection against transient voltages such as electrostatic discharge and induction as well as power line surges. The SA170A-E3/73 is also suitable for application in digital and analog circuits and may be used as either a shunt diode on a bus, or a series diode within a connector.

The SA170A-E3/73 has also been used in battery-powered applications. When connected to a battery, it protects the circuit and electronics from sudden rises in voltage that would otherwise damage the circuit board. This diode is also used in automotive applications as a way of protecting the electrical systems from power spikes, lightning, and other sources of transients.

Working Principle

The SA170A-E3/73 diode works by clamping high-voltage transients. When a sudden surge in voltage exceeds a predetermined level, the diode will be activated and clamp the voltage at that level, thus limiting the current flow through the circuit.

The mechanism behind this voltage-clamping arrangement is based upon the physical structure of the diode. A p-n junction is formed between two layers of silicon. When a positive voltage is applied to the anode and a negative voltage is applied to the cathode, current will begin to flow through the junction. The current flow through this p-n junction is proportional to the voltage differential, and thus allows the voltage to be regulated.

When a sudden surge in voltage is encountered, the voltage across the p-n junction will reach a threshold level where it breaks down and conducts current. This breakdown will cause the voltage across the junction to be clamped at this level until the surge dissipates.

Conclusion

The SA170A-E3/73 is a versatile and reliable diode designed for overvoltage protection in a variety of applications. By a combination of the proper application of the diode and its special p-n junction design, devices can be protected from power line surges and electrostatic discharge events. This makes the SA170A-E3/73 an invaluable component in the field of transient voltage suppression.

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