SM4T23AY

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Surge-Protected Transient Voltage Suppressors (TVS diodes) are a family of solid-state electronics designed to prevent damage to sensitive circuits from high-voltage transients, such as electrostatic discharge (ESD), electrical fast transient (EFT) and lightning strikes. SM4T23AY diodes are particularly suitable for ESD protection, with an effective clamping voltage of 23V and a relatively fast response time to ESD events, which makes them ideal for protecting sensitive communications circuits.

SM4T23AY diodes are bidirectional devices, meaning they can protect against both positive and negative voltage surges by clamping the voltage to an intermediate level. This offers protection to a variety of components in communications systems. The devices are small enough to fit on surface mount boards, with a low capacitance of up to 2pF when operating within a voltage range of -10 to +23V.

SM4T23AY diodes also include a built-in reverse transistor that allows the device to be switched on and off. This switch can be used to disconnect the circuit when needed, for example to isolate it from ground during measurements or to protect against backfeeding of current to the power grid. The integrated circuits also offer protection against overvoltage and overcurrent transients, and they are rated for operation up to 175°C.

The working principle of SM4T23AY diodes is based on the principle of avalanche breakdown. When a voltage surge is applied to the diode, the electric field across the junction increases beyond the breakdown voltage, causing electron-hole pairs to be created. These pairs redistribute themselves across the junction, forming a conductive path that can divert the charge to ground, thereby providing protection to the circuit.

To ensure reliable operation over a wide range of conditions, SM4T23AY diodes are usually combined with other components such as zener diodes and varistors. The combination of these components creates an “active” circuit that can effectively clamp the voltage to a safe level, and also limit the amount of current that flows through the device. This helps to protect both the diode and the circuit from damage caused by high-voltage transients.

SM4T23AY diodes are an ideal protection solution for sensitive communication circuits, providing protection against high-voltage transients effectively and reliably. By combining several components in an active circuit, the devices offer a robust and cost-effective approach to protecting the circuit from damage. This makes them an attractive option for a variety of applications.

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