MXPLAD7.5KP10A Circuit Protection

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A TVS diode (transient voltage suppressor) is an electronic component designed to protect vulnerable circuits against voltage spikes that can exceed the normal operating voltage range. The MXPLAD7.5KP10A is a small unidirectional TVS diode used to provide a low-cost solution for overvoltage and ESD protection of automotive or low power electronic circuitry. This article will discuss the MXPLAD7.5KP10A application field and its working principle.

The MXPLAD7.5KP10A is a low power unidirectional TVS diode designed for electrostatic discharge (ESD) protection in automotive and power electronic applications. The device is bi-directional and has a peak power rating of 10A. It has a low stand-off voltage of 7.5V, allowing it to effectively protect against damaging overvoltage spikes up to 15V. It features a fast response time of less than 1ns, making it especially suitable for protecting against lightning and power line surges. In addition, it is rated for operation in temperatures from -50℃ to 150℃, making it suitable for use in harsh environments.

When used in an application, the MXPLAD7.5KP10A provides a short-circuit protection by clamping a voltage spike to a preset safe level. This clamping action is enabled by a combination of two key components: the TVS diode and the Zener diode. The combined devices (two separate components in series) provide a low-cost overvoltage and ESD protection solution.

The TVS portion operates by first detecting an overvoltage and then clamping it to a safe level. When a voltage spike is detected, the TVS junction capacitance is reduced through a novel temporary “short-circuit” process. This reduces the voltage across the junction while maintaining a low on-state resistance. The device then progressively clamps the waveform to a safe level set by the Zener diode.

The Zener diode is used to establish the standby voltage or “breakover” point of clamping. When the input voltage is below this voltage, the Zener diode will remain reverse biased and will not be triggered. However when the voltage exceeds this level, the diode will become forward biased and effectively act as an electrical valve, limiting the voltage to the Zener voltage level.

In summary, the MXPLAD7.5KP10A is a unidirectional TVS diode suitable for use in applications requiring overvoltage and ESD protection. It comprises two components, the TVS diode and the Zener diode, working together to provide a low cost and effective solution for ESD and overvoltage protection. Its fast response time makes it especially suitable for protecting vulnerable circuits against lightning and power line surges.

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