SMPC7.0A-M3/87A Circuit Protection

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Transient Voltage Suppressor (TVS) diodes are used to protect electrical circuits from high-voltage or electrostatic discharge (ESD) transients. They also offer protection against high-voltage pulses caused by lightning strikes or other transient events. The SMPC7.0A-M3/87A is a TVS diode from Weidmuller designed to protect sensitive electronic components and circuits from high-voltage transients. It provides a low dynamic resistance of 4.8Ω maximum, making it suitable for applications where fast response time and low transient voltages across the protected equipment are required.

The SMPC7.0A-M3/87A is a dual-line thyristor diode designed to protect one AC power line. The diode features a fast response time of 5ns maximum, a low leakage current of 10µA at 8V, a low capacitance of 5pF at 24V, and a stand-off voltage of 7.0V±15%. The diode has a rated pulse power dissipation of 129W peak, and a maximum clamping voltage of 14V. The power surge can be ordered with either non-self-extinguishing or radiation-hardened packages.

The SMPC7.0A-M3/87A can be used to protect critical equipment against transients caused by electrostatic discharges, spikes from lightning strikes, and other sources. The protection provided by this diode reduces the chances of an overload or a short circuit damaging the equipment. Furthermore, it can help reduce the cost of repairs and downtime, by protecting the sensitive electronic components from spikes and surges caused by external sources.

The working principle of the SMPC7.0A-M3/87A is based on the thyristor switch, which acts like a bidirectional gate between the protected line and GND. When the voltage on the protected line rises above the stand-off voltage, the thyristor switch opens, allowing the current to pass to ground. The energy is dissipated as heat in the diode body, while the voltage across the protected line is clamped at a safe level. When the voltage falls below the stand-off voltage, the thyristor switch turns off, disconnecting the line from ground.

The SMPC7.0A-M3/87A is suitable for a variety of applications, such as computers and consumer electronics, medical equipment, automotive systems, and industrial equipment. It is also used in high-voltage AC power line protection, as well as in power supplies and motor drives. The device is available in a variety of packages, including SOIC, SOT223, and SOT23. The SMPC7.0A-M3/87A is RoHS compliant and meets the requirements of IEC 61000-4-2, IEC 61000-4-3, and IEC 61000-4-4 for ESD and surge protection.

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