VDRS07H230THE

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TVS (transient voltage suppressors) are devices used by engineers to protect circuits from acquired voltage that surpasses a normal value. These devices come in different varieties, such as Varistors, MOVs, Zener diodes and others. One such device is the VDRS07H230 which is a Varistor, also known as a voltage dependent resistor or VDR. This article will discuss the application field and working principle of the VDRS07H230.

Varistors, such as VDRS07H230, are non-linear resistors that show different values of resistance depending on the applied voltage, allowing them to limit voltage peaks. They offer protection against short-circuit and over-voltage. Generally, they have a symmetrical voltage-current characteristic, meaning that the positive and negative voltages of a waveform can be equal. As the voltage level rises, the resistance value drops, providing limiting circuit protection with high holding capacity. Due to this high peak current capability, Varistors are often used in locations where high current is expected.

The VDRS07H230 Varistor is a 7mm voltage-dependent resistor that provides protection against voltage transients with a self-recovery threshold of 230 volts per μs. It has an operating voltage range from 14 to 260 volts and can turn-on at a rated voltage of 275 volts maximum. The device offers up to 500 A of peak impulse current and operates at a maximum temperature of 110°C. In addition, the device is highly stable, with a low voltage coefficient and maximum amount of capacitance.

As previously mentioned, Varistors have a variety of applications. They are widely used in the medical, automotive, telecommunications, aerospace, computer and consumer electronics industries. Medical applications include medical instruments and ion therapy as well as implantable devices, such as pacemakers and implantable insulin pumps. Automotive uses include power window regulators and alarm systems. The telecommunications and aerospace industries use Varistors for signal protection and interference control. In consumer electronics, Varistors are found in power supply circuits, which help to protect the devices from electrostatic discharge and surge damage.

The working principle of Varistors is based on a special junction between a metal oxide and semiconductor material. When a voltage is applied across the device, it creates a tunneling effect in the metal oxide layers, increasing the current. This, in turn, leads to a decrease in resistance and a decrease in the peak voltage. This reduces the risk of over-voltage and associated damages. Therefore, Varistors are a dependable way to protect sensitive components from damaging voltage transients.

In summary, the VDRS07H230 Varistor offers protection against over-voltage and is designed for a wide range of applications. With a peak current absorption of 500 A, the device is highly stable with a low voltage coefficient and maximum amount of capacitance. The device is highly dependable and offers protection against voltage transients. Its working principle is based on a special junction between a metal oxide and semiconductor material, which creates a tunneling effect in the metal oxide layers when a voltage is applied.

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