B72220T2681K105

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Varistors are an important type of electrical component used in power industry to protect sensitive devices from electrical over-voltage. B72220T2681K105 is a type of the varistor manufactured by EPCOS, which is especially designed for over-voltage protection of data equipment and communication systems. It is made to efficiently absorb and dissipate electrical spikes reducing the induced over-voltage.

A varistor, or voltage-dependent resistor (VDR) is a passive two-terminal electronic component with an asymmetric voltage–current characteristics, which is nonlinear (they are made of a sintered mixture of metal oxide such as zinc oxide). The basic function of a varistor is voltage dependent surface conduction, which means that the current on the device is dependent on the voltage across it.

B72220T2681K105 is a metal oxide varistor (MOV) with a voltage clamp of 18V-24V. The device comes in a 7.2mm x 5.6mm x 5.7mm SMD package and contains two ceramic discs encased in plastic bed filled with zinc oxide, a non-linear material. It has a capacitance of 14pF and inductance of 0.2µH. The device has a maximum peak pulse power rating of 8.2kW (10/1000µs). This is the maximum power rating wherein the operating temperature should not exceed.

The most important feature of the varistor is its voltage-dependent resistance; that is, it has a low resistance at low voltage, but when the voltage across it increases above its breakdown voltage, its resistance increases significantly. Thus, it can absorb and dissipate electrical spikes.

In applications, B72220T2681K105 is often used in AC- DC circuits with power lines. It is mainly used as a surge protector, keeping sensitive circuitry from dangerous transients. When a surge exceeding the breakdown voltage of the device is applied, the device “clamps” the voltage, keeping the voltage levels at a safe level. The device is mainly used in portable devices such as laptops, mobiles and tablets that are often exposed to electrical surges.

In summary, the B72220T2681K105 metal oxide varistor is an important device used to protect communication and data equipment against voltage surges. It is designed to absorb and dissipate electrical spikes, while clamping the voltage at the same time. This device proves to be a reliable and cost effective solution to protect sensitive electrical devices from hazardous transients. Therefore, it can be used safely in numerous AC-DC power applications.

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