SM5S16ATHE3/I Circuit Protection

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Introduction

SM5S16ATHE3/I is a kind of TVS diode that is widely used in a variety of applications and embedded systems including automotive, railway, industrial and medical applications. This article examines the application field and working principle of the SM5S16ATHE3/I.

Application fields of SM5S16ATHE3/I

SM5S16ATHE3/I is a unidirectional transient voltage suppressor (TVS) diode suitable for a variety of applications where overvoltage or ESD protection is required. It offers superior ESD and surge protection by clamping and dissipating the energy resulting from an electrical surge or spike. Typical applications include:

• Automotive electronics - SM5S16ATHE3/I is widely used in automotive electronics such as ECUs, dashboard controllers, lighting systems, and other vehicular electronics.
• Railway electronics - It is also used in railway electronics, including train control systems, trackside antennas, and other signalling electronics.
• Industrial electronics - SM5S16ATHE3/I is often used in industrial electronics, such as industrial controllers, elevator controls, and other industrial automation systems.
• Medical electronics - It is used in a variety of medical electronics, including vital sign monitors, ECG machines, and other medical imaging and diagnostic equipment.

Working principle of SM5S16ATHE3/I

The SM5S16ATHE3/I is comprised of two components: a Thyristor triggered by an avalanche diode (or Triggered Diode). When a transient voltage (such as an ESD pulse or a surge) is applied across the device, the avalanche diode releases electrons which trigger the thyristor and cause it to turn "on". This is referred to as the breakdown voltage. Once the breakdown voltage is reached, the thyristor begins to conduct and dissipates the energy from the transient voltage. This is referred to as the clamping voltage.

The SM5S16ATHE3/I also features a voltage regulating mechanism which act like a clamp, regulating the output voltage of the protected circuit to a safe level. The voltage regulating mechanism is triggered when the voltage across the device reaches a certain level. At this point, the thyristor begins to act as a switch, conducting current from its anode to its cathode and thus regulating the output voltage of the protected circuit.

In addition, the SM5S16ATHE3/I also features a thermal protection mechanism which prevents the device from being damaged by overheating. This is done through the use of a thermal sensing element which senses any increase in the device\'s temperature and shuts the device off in response.

Conclusion

SM5S16ATHE3/I is a unidirectional TVS diode suitable for a variety of applications where overvoltage or ESD protection is required. It is widely used in automotive, railway, industrial and medical electronics due to its ability to provide superior ESD and surge protection. It is also equipped with a voltage regulating mechanism and a thermal protection mechanism, making it a robust and reliable choice for many applications.

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