SM5S18AHE3_A/I Circuit Protection

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The SM5S18AHE3/I TVS diodes are a reliable and robust solution to protect downstream circuits against surges caused by lightning-induced transients. It is designed with an integrated protection structure that combines zener clamping with avalanche breakdown, providing excellent protection from electrostatic discharge (ESD). It also has excellent thermal stability, high reliability, and low dynamic impedance.

The SM5S18AHE3/I features 18V of unidirectional peak pulse power dissipation (over 10 x 1000µs waveform) and is capable of dissipating 28A peak pulse current. Additionally, these diodes are designed to provide protect against any unexpected transient voltage with a response time of less than 1.0 ns. They have a maximum capacitance of only 11pF, minimizing the signal degradation associated with TVS Diode protection.

The application field of the SM5S18AHE3/I is varied depending on the requirement of different industries. Its common applications include automotive sensors, telecom applications, power conversion, and general-purpose circuit protection, and it is widely used in various fields requiring surge protection and ESD protection. Its working principle is based on the functioning of a diode structure – when the voltage exceeds its threshold, it will start conducting electricity until the transient voltage goes below the breakdown voltage.

When exposed to the transient voltage, the SM5S18AHE3/I firstly absorbs the transient energy through its zener clamping mechanism. This clamping mechanism works by rapidly tracking the instantaneous voltage and preventing it from exceeding the zener breakdown voltage. Then, avalanche breakdown comes into play as the voltage further increases, where the breakdown voltage and current is limited by the PN junction. The avalanche breakdown then dissipates any additional energy from the transient voltage. This double protection mechanism ensures reliable circuit protection with minimal signal degradation.

In conclusion, the SM5S18AHE3/I TVS Diodes offers excellent protection from ESD and surge events, and its quick response time and low dynamic impedance provides optimal protection from transient voltage events. It is widely used in automotive, telecom, and general-purpose applications, and offers an integrated protection structure that combines zener clamping and avalanche breakdown.

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