SA7.5-E3/73

TVS (transient voltage suppressor) diodes are typically used to protect circuits against dangerous electrical transients, such as lightning or electrostatic discharge (ESD). The SA7.5-E3/73 is a popular TVS diode used for this purpose. This article will discuss the application fields and working principle of the SA7.5-E3/73.

Applications

The SA7.5-E3/73 is a unidirectional diode, meaning it will only allow electrical current to flow in one direction. This makes it well-suited for use in circuits with alternating current (AC) power sources, such as those found in factories and other industrial environments. The SA7.5-E3/73 can also be used in circuits that have direct current (DC) power sources.

The SA7.5-E3/73 is commonly used to protect circuits against electrical spikes caused by static discharge or transient voltage. This includes ESD events, such as when a person is handling a static-charged electronic component and accidentally shorts it out. In addition, the SA7.5-E3/73 can be used to protect circuits against lightning strikes.

Working Principle

The SA7.5-E3/73 is constructed of two semiconductor layers, which allow it to conduct current in one direction and block it in the other. This is known as a reverse-biased avalanche diode. When a voltage transient occurs, the voltage across the diode causes its current to increase, forcing it to act as a short-circuit. This limits the flow of current and keeps it from reaching any of the other components in the circuit.

The SA7.5-E3/73 is designed to hold a steady voltage of 7.5V, up to 25A of current. This makes it well-suited for protecting both low-voltage and high-current circuits. It also features a low reverse leakage current of 25µA, ensuring that it will not interfere with the normal operation of the circuit.

Conclusion

The SA7.5-E3/73 is a popular TVS diode, commonly used to protect circuits against dangerous voltage transients. It is designed to handle currents up to 25A and hold a steady voltage of 7.5V, making it well-suited for use in both AC and DC circuits. The low reverse leakage current of 25µA ensures that it will not interfere with the normal operation of the circuit.