TVS - Diodes

Transient voltage suppression (TVS) diodes, also known as surge-suppression diodes, are electrical components used to protect electrical circuits from voltage spikes. These devices limit the amount of voltage entering a circuit and also protect the circuit from overvoltage spikes that can damage the system. In this article, we will discuss the application field and working principle of the SMAJ170 TVS diode.

Application Field

The SMAJ170 TVS diodes are ideal for a variety of electrical systems. It is commonly used in telecom, automotive, military, and consumer electronics applications. Its applications include voltage clamping, load transient suppression, electrostatic discharge protection, circuit noise control, and power-on reset protection.

Working Principle

The SMAJ170 TVS diodes are a type of diode that redirects and clamps voltage spikes. This diode is designed to act as a current-limiting component, allowing only the desired level of current to pass through it. It works by clamping the rising voltage below its breakdown voltage, thereby diverting it to ground.

In operation, the SMAJ170 TVS diode is connected in parallel to the circuit. When a voltage spike occurs, the diode’s breakdown voltage allows the current to flow, thus redirecting the spike away from the circuit. The speed with which it responds depends on the number of elements in the diode, as well as its temperature rating and response time. The SMAJ170 TVS diode is capable of responding to high frequencies up to 10kHz.

The SMAJ170 TVS diode is also designed to have a built-in reverse alternation protection. This means that the diode will open its clamping action when the voltage spike is of opposite polarity as the breakdown of the diode. This prevents the appearance of additional transients when the opposite polarity of voltage spike is present.

In addition to protecting against voltage spikes, the SMAJ170 TVS diode also helps to suppress noise. Noise generated by switching, or other sources, causes interference in the circuit, leading to incorrect operation. The SMAJ170 TVS diode is designed to attenuate such noise, providing a robust and reliable protection.

Conclusion

The SMAJ170 TVS diode is a widely used electrical component for suppressing voltage spikes and reducing noise in electronic systems. Its applications include telecom, automotive, military, and consumer electronics. It works by redirecting and clamping voltage spikes and has a reverse alternation protection that prevents additional transients from appearing. It is capable of responding to high frequencies up to 10kHz and is designed to provide reliable operation in different environments.