SMAJP4KE20A-TP Circuit Protection

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The SMAJP4KE20A-TP TVS - Diode is a high-performance Transient Voltage Suppression diode typically used in high-voltage industrial applications. This device provides superior protection from over-voltage faults for sensitive electronics and power supplies. Its construction and working principles are discussed in detail below.

Construction

The SMAJP4KE20A-TP is a semiconductor device constructed from a silicon substrate and multiple layers of doped semiconductor material. Its design includes a thick-film outer layer material terminations and a thick-film protection diode. Terminations are usually formed from a gold, palladium or tin-silver alloy to facilitate electrical connection to the chip.

Its diode consists of a PN junction which is reversed biased, meaning the diode is reverse voltage protected. The structure of the diode is designed to prevent the flow of current unless a surge or over-voltage is present. When an over-voltage occurs, the voltage on the diode’s anode vastly exceeds that of its cathode, causing the diode to break down and provide protection from the surge.

Working Principle

When an over-voltage surge occurs, the SMAJP4KE20A-TP device’s diode breaks down, reducing the potential of the surge. This results in a reduction in the magnitude of the surge. The device’s gold outer layer provides excellent dissipation of the energy contained in the surge, helping to reduce the magnitude even further. When the surge is properly dissipated the SMAJP4KE20A-TP restores the device to its normal working state.

The SMAJP4KE20A-TP offers superior protection from high-voltage surges compared to other typical protection devices. This diode is able to absorb up to 1000V, more than double the protection offered by standard protection diodes. Its thick-film outer layer also helps to minimize capacitive coupling across the TVS, further ensuring a stable system.

Application Field

SMAJP4KE20A-TP devices are commonly used in automotive applications, such as vehicle instrumentation and navigation systems. They are also found in consumer electronics, such as cell phones, tablets, and laptop computers. In addition, the SMAJP4KE20A-TP is highly suitable for industrial applications, specifically in power supplies, voltage regulators, and sensitive communication systems.

The SMAJP4KE20A-TP is often used in harsh environments, such as on field buses, power supplies, and pressure sensors. Its robust construction and protection capabilities make it ideal for environments where protection against high-voltage surges is a must.

Conclusion

The SMAJP4KE20A-TP TVS - Diode is a robust protection device designed to protect sensitive electronics from high-voltage surge events. Its PN junction diode, thick-film outer layer, and gold terminations provide superior protection from surges up to 1000V. Additionally, this SMAJP4KE20A-TP offers excellent protection in harsh environments, making it well suited for automotive, consumer electronics, and industrial applications.

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