SMF11A-HE3-18

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Transient voltage suppressors (TVSs) are electromechanical components designed to absorb and dissipate short-duration voltage transients. They are commonly used in a variety of applications to protect equipment from overvoltage transients produced by lightning, electromagnetic interference (EMI), and switching transients. A popular type of TVS diode is SMF11A-HE3-18. It has a dual role in protecting equipment against overvoltage transients. First, it serves as a rectifier, preventing voltage spikes from entering unintended paths. Then, if the voltage exceeds the breakdown limit, it acts as a Zener diode, reducing the voltage to a safe level.

SMF11A-HE3-18 is specially designed to tolerate robust transient and ESD (electrostatic discharge) surges. It provides protection in a variety of applications including portable and mobile devices, consumer electronics, automotive and industrial systems. This TVS diode is rated with a wide range of Clamping Voltage (VCL) from 5.7 to 32V, an IEC 61000-4-2 discharge current rating of 28A (4kV contact, 8kV air), and a maximum peak pulse power rating of 600W (10/1000 µs waveform).

SMF11A-HE3-18’s working principle is based on Impulse Discharge Current (IDC). When a voltage transient is applied, the diodes in the device store electrical energy and begin to conduct a tiny current. The current increases rapidly, resulting in a two-part behavior. First, the diode begins to act as a reverse polarity rectifier, preventing the voltage from exceeding the VCL value. The IDC is passed through, followed by a sharp decreasing voltage that is eventually almost zero.

In addition to the IDC, the TVS diode also has a constant current discharge function. As the transient voltage increases, the IDC reaches a peak and then decreases sharply. The constant current discharge function of SMF11A-HE3-18 reduces the voltage to the safe level, allowing it to pass safely through the system. This ensures that no harm is caused to the sensitive electronic components of the system.

Overall, SMF11A-HE3-18 is an effective and reliable way to protect sensitive electronic components from overvoltage transients. It provides protection with a wide VCL range, IEC 61000-4-2 discharge current rating, and a maximum peak pulse power rating of 600W. With its combination of IDC and constant current discharge functions, it is able to quickly reduce the voltage to a safe level. Given its features, SMF11A-HE3-18 is well-suited for protecting a wide range of applications from portable and mobile devices, consumer electronics, automotive, and industrial systems.

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