V18ZC40PX2855

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TVS - Varistors, MOVs are crucial components in electronic devices and circuits. One of the most commonly used components from the family of TVS – Varistors, MOVs is V18ZC40PX2855. This device is a low clamped Transient Voltage Suppressor (TVS) and has different applications and functioning principles.

V18ZC40PX2855 is an axial-leaded component which contains silicon-based zener and silicon avalanche diode constructio. This device can stack up to 40 volts of open circuit transient and is usually mounted on a printed circuit board in series with the component to be protected. Its reverse leakage current is zero and it has low clamping voltage thanks to its nonlinear voltage-current characteristic.

V18ZC40PX2855 is also quite common in communication systems. It is used to limit short spikes from lightning, electrostatic discharge, surges, and other high-voltage power sources on cables and power lines while maintaining system stability and integrity. This device contains relatively low capacitance values, which can make it perfect for protecting sensitive circuitry.

As for its working principle, V18ZC40PX2855 uses a nonlinear current-voltage characteristic to manage high-voltage pulses. When a high-energy pulse reaches the device, it immediately reduces the energy within the device’s die, thus minimizing the overvoltage and providing short-term protection. The device works in three stages: pre-breakdown, breakdown, and post-breakdown stages.

The first stage is the pre-breakdown, when the device experiences buildup of the current until it reaches the maximum energy value stored in the junction. In the breakdown stage, breakdown occurs due to the electric field and the avalanche. The avalanche increases the current drastically. Finally, in the post-breakdown phase, the resulting electric field generates a balance between the reverse current and power dissipation.

Overall, V18ZC40PX2855 is a superior component with its nonlinear voltage-current characteristic, low clamping voltage, and superior performance when it comes to managing short-duration high-voltage spikes. It’s used in many applications, primarily in communication systems, and its working principle helps limits high-voltage spike damage.

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