V391HF34

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TVS - Varistors, MOVs, are widely used electronic components mainly designed for protection of circuits against over-voltage transients. The V391HF34 is a variation of these components, with special characteristics that make it suitable for certain applications.

The V391HF34 is a medium-performance varistor designed with a symmetrical tolerance. It is made from a zinc oxide compound that can dissipate up to 350 mW of power with a lower voltage rating of 30V. The device can also withstand a peak surge current of 500 A.

The advantages of V391HF34 are that it has a wide operating temperature range of -40°C to +125°C, making it suitable for use in harsh environments. It also has a relatively low series resistance of 0.001 ohms, ensuring a low power dissipation even at high-currents, and a low capacitance of 0.4 pF.

The V391HF34 can be used in several application areas, mainly in the fields of power systems and telecommunications. Some of the main areas in which the device can be used include lightning and surge protection in printed circuit boards (PCBs), surge protection in TV and sound systems, suppression of micro-processor noise in power converter designs, and power over Ethernet (PoE) applications.

In terms of working principle, the V391HF34 functions as a voltage-dependent resistor. This means that the device’s resistance to current varies according to the voltage applied. As the voltage increases, the resistance decreases and the device becomes more conductive.

When an over-voltage transient occurs, the device clamps the voltage to a safe level. This is because the device has an intrinsic times coefficient that limits the rate of change of the voltage. Thus, the device functions by limiting the voltage to a level that is safe for the circuit being protected.

In summary, the V391HF34 is a medium-performance varistor with a symmetrical tolerance. It has several advantages, such as a wide operating temperature range and low series resistance. Additionally, it has several application areas, including lightning and surge protection in PCBs, PoE applications, and suppression of micro-processor noise in power designs. Finally, the device works as a voltage-dependent resistor, clamping the voltage to a safe level when an over-voltage transient occurs.

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