0070.3511.A2

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TVS - Varistors, MOVs, are electrical components which are used to protect circuits—like electrical appliances and consumer electronics—from the sudden and damaging surge currents that can flow through them due to power outages, lightning strikes, and other events. The 0070.3511.A2 varistor is one such protection device, with its own specific characteristics. This article will explore the application field and working principle of the 0070.3511.A2.

The 0070.3511.A2 is a surface mount varistor designed for high current, low inductance protection applications. It is commonly used to protect DC power rails, switching regulators, reverse polarity protection, and high-frequency guitar amplifiers. The varistor has a peak surge current rating of 275A, with a maximum voltage rating of 56.4 VDC. It has an effective capacitance of 0.17 pF and a maximum clamping voltage of 24.8 VDC.

The 0070.3511.A2 varistor operates via the principle of metal oxide varistors, or MOVs. MOVs work on the principle of a voltage-dependent resistor: a nonlinear, two-terminal device whose resistances differs with the voltage across it. When no voltage is applied, the MOV acts as an open circuit and no current flows through it. Once the voltage across its terminals reaches a certain threshold, known as the “clamping voltage,” the varistor begins conducting. The current then increases exponentially with the voltage.

When an unexpected surge current passes through the MOV, the increased current causes the MOV to “clamp” and reduce the voltage drop across itself, significantly limiting the voltage passing through the electronic component being protected. This protection prevents any permanent damage to the electronic component, thus saving it from destruction or serious malfunction.

In conclusion, the 0070.3511.A2 varistor is a surface mounted protection device designed for high current, low inductance applications. When an unexpected surge current passes through the MOV, the clamping voltage is lowered, significantly reducing the total voltage being passed through. This characteristic makes MOVs a particularly effective protection device for a variety of applications, ranging from DC power rails to reverse polarity protection and audio amplifiers. As such, it is an important part of any electrical component’s protection system.

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