A5KP18A-G Circuit Protection

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TVS - Diodes are widely used for a variety of applications such as overvoltage protection, EMI/RFI filter and, more recently, as an industrial countermeasure against harmful interferers in logic lines. The A5KP18A-G is a popular TVS-diode model that is used for industrial applications that require a high-quality, reliable prevention of any damage from transients. Its features and construction help to produce the desired protection.

The A5KP18A-G device is a bidirectional, low-capacitance, Transient Voltage Suppressor (TVS) diode. It offers unidirectional and bidirectional overvoltage protection from spikes and transients due to lightning, electrostatic discharge (ESD) or other transient sources. The device is a dual-gate, silicon-controlled TVS diode with a breakdown voltage of 18V and a maximum clamping voltage of 25V..

The A5KP18A-G consists of two p-n-p-n junction devices connected in series. The device has a low nonlinear dynamic resistance to reduce power dissipation during current surge. Its dual-gate construction allows the device to respond to transient level at the anode and gate. It has a low internal capacitance that reduces the effects of voltage transients on analog and data line signal integrity.

The A5KP18A-G is designed to be used over a wide operating-temperature range from -55 °C to 125 °C. The device provides a low on-state (flow) resistance to minimize power dissipation. It also has high pulse-power capability that improves its ability to protect against transients in high-power applications. Its rating of 30A peak reverse current makes the device suitable for use in infrequent, low-power, transient events.

The A5KP18A-G works by allowing a controlled flow of current through its two series-connected p-n-p-n junction devices in response to transient spikes. The device acts as a voltage-controlled switch, opening its junctions whenever a high enough voltage is applied to the gate. The circuit is inversely triggered when below the device’s breakdown voltage, so the current of the transient spike can be diverted and dissipated safely.

During a transient event, the p-n-p-n devices clamp the incoming voltage to a predetermined level and then dissipates the excess energy by controlling the flow of current to a safe level. This helps to reduce the effects of spikes on sensitive circuits and prevents any damage that could be caused by the transient. The device can prevent overvoltage transients or surges, ESD, and other harmful interferences from affecting the connected component.

Overall, the A5KP18A-G is a high-quality device designed for industrial applications that need reliable protection from transients or spikes. It works by allowing a controlled flow of current through its two p-n-p-n junction devices, clamping the incoming voltage to a predetermined level and dissipating the excess energy safely. It offers protection against a range of overvoltage transients, ESD, and other interferences, making it an ideal choice for industrial applications.

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