0071.1521.A2

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Varistors, such as the 0071.1521.A2, are used to provide EMI/RFI noise protection, limiting surges and over-voltage, and at the same time dissipating large amounts of energy. Varistors are solid-state region devices, which have the same two semiconductor layers as a diode, but with a heavily doped region, made of a non-linear material, between them. This heavily doped region is called the varistor region, which acts as a variable resistance. Depending on the varistor material used, such as zinc oxide, the varistor will have a specific response.

Varistors, in particular the 0071.1521.A2, have two main characteristics, which are voltage and current. The voltage characteristic, as shown in Fig.1, is the voltage at which the varistor becomes operational. This is referred to as the breakdown voltage, and is determined by the varistor material and the applied voltage. The current characteristic, as shown in Fig.2, is the current that the varistor can dissipate in order for it to remain operational.

The two characteristics of the 0071.1521.A2 are used to determine its application field and working principle. The application field of the 0071.1521.A2 is mainly for over-voltage and EMI protection. It is used in a variety of applications, such as home appliances, industrial equipment, servers, telecommunications systems, and even aerospace. The varistor is connected across the circuit or system being protected, making it the first line of defense against over-voltage or EMI.

The principle spoken for the application field of the 0071.1521.A2 is that when an over-voltage occurs, the varistor will become conductive and absorb the excess energy. This is thanks to its non-linear varistor region which will become stranded with an increase in voltage, thus limiting the current and voltage that passes through it. This reduces the magnitude of the over-voltage, protecting the system or circuit from being damaged. In the case of EMI, the varistor will absorb the energy from the low-level signals in the range of high-frequency electromagnetic fields.

The 0071.1521.A2 is designed for protection against both over-voltage and EMI interference, allowing it to be used in a variety of applications. Its two characteristics, voltage and current, make it suitable for both applications. Thanks to its non-linear varistor region, it is able to absorb the excess energy, limiting the magnitude of the over-voltage and providing EMI protection.

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