SMF28A-M3-18 Circuit Protection

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Television (TV) protectors, also known as transient voltage suppressors (TVSs), are widely used to protect electronic components, circuits, cables, or systems from overvoltage transients caused by electrostatic discharge (ESD), lightning, and so on. SMF28A-M3-18 is a popular device of TVS - Diodes. This article discusses the application and working principle of SMF28A-M3-18.

In terms of application, SMF28A-M3-18 is specially designed to protect against transient overvoltage and surges caused by lightning or electrostatic discharge (ESD). It is widely used in the automotive electronics, home appliance and other fields, such as engine operation control, windows operation system, power converters, inverters, trigger coils, and ESD protection. Besides, it can also be used as an ESD protective element for sensitive devices.

In terms of its working principle, SMF28A-M3-18 is a high power Zener diode. It has a dual terminal structure and is designed mainly for transient protection. The device is made up of a sacrificial element that breaks at one terminal rupture sensing current and a thyristor element formed by the junction of PNPN layers. The PN junction provides a reverse biased voltage clamping action for transient voltages, while the thyristor element provides a protected low voltage clamping action for high voltages. When the transient voltage reaches the Zener breakdown level, the device will instantly break down and clamp the voltage.

In conclusion, due to its unique electrical characteristics and variety of application fields, SMF28A-M3-18 is a popular device of TVS - Diodes used to protect electronic components, circuits, cables, or systems from overvoltage transients caused by electrostatic discharge (ESD), lightning, and so on.

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