SM5A27HE3/2E

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TVS - Diodes

A TVS (Transient Voltage Suppressor) diode is a diode used as a protective device against overvoltage transients. It is a voltage dependent, bidirectional three terminal device specifically designed to protect sensitive semiconductor circuits from potentially damaging ESD (electrostatic discharge) events, electrical fast transients (EFT), and other voltage spikes. The SM5A27HE3/2E is one of the most popular TVS diodes available today. This article focuses on the application fields and working principles of the SM5A27HE3/2E.

Application Fields of SM5A27HE3/2E

The SM5A27HE3/2E is designed primarily for protection against ESD and lightning induced transient voltages. It can be used as a first line of protection for data lines, circuitry, and I/O devices against any sudden increases in voltage. It is suitable for AC and DC systems, and can be used for a variety of applications including signal level protection, communications and power line protection. Due to its low parasitic inductance, the SM5A27HE3/2E is especially suitable for high-frequency application circuits.

Working Principle of SM5A27HE3/2E

The SM5A27HE3/2E is a voltage dependent controller. It is composed of two diodes connected in series with a control electrode located between them. When a voltage higher than a predetermined threshold is applied, the control electrode will turn on and the two diodes will become conducting. This will effectively short circuit the overvoltage pulse, reducing its duration and amplitude and protecting the underlying components from damage. The breakdown voltage of the device is determined by the pressure applied to the control electrode and the control current through the device.

Other Key Features

The SM5A27HE3/2E also comes with some additional features. Some of these features include its low clamping voltage, fast response time, and high surge current capability. It also has a low capacitance, meaning it does not interfere with the electrical signals it is protecting. Additionally, it also has an extremely high breakdown voltage for improved robustness.

Conclusion

The SM5A27HE3/2E is a widely used TVS diode designed to protect sensitive semiconductor circuits from potentially damaging ESD, EFT, and other voltage spikes. Its application fields include protection of data lines, circuitry, and I/O devices, and it is suitable for both AC and DC systems. Its working principle based on a pressure applied to a control electrode and the control current through the device enables it to effectively short circuit an overvoltage pulse. The additional features such as its low clamping voltage and high surge current capability, along with its low capacitance, make it a very reliable device.

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