ERZ-E07E201

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TVS (Transient Voltage Suppressors) devices are designed to protect vulnerable electronic components from high energy transient voltages, often caused by lightning or other powerful electrical events. Varistors, Metal Oxide Varistors (MOVs) and Bidirectional TVS (whose common abbreviation is BTVS) are the three main categories of TVS devices. Today, we will focus on ERZ-E07E201 Varistor, a common type of MOV, and discuss its application field and working principle.

The ERZ-E07E201 varistor series is a new type of nonlinear, MOV type of Varistor technology and is widely applied in consumer electronic products, communications, and automotive fields. It has a wide voltage ratings range from 4VDC to 240VDC and a very low leakage current. With five values of ESR options (M2, M3, M4, M5 and M6), ERZ-E07E201 Varistor provides the advantages of excellent EMC (electromagnetic compatibility) performance, perfect clamping capability and low surge response time, which make it suitable for use in high-bandwidth, high-frequency AC and data applications.

Now let\'s dive into the working principle of Varistors. In general, a varistor is basically a two-terminal, nonlinear passive device. It is made up of a set of metal oxide semiconductor material sandwiches between two ceramic discs. By applying a voltage to this device, its resistance changes drastically. When the applied voltage reaches the rated breakdown voltage of the device, it starts to turn on and its resistance suddenly drops, allowing current to flow. The current that flows through the Varistor is limited by its voltage drop due to its non-linear nature, which acts as a surge protection in the circuit.

When the voltage across the MOV is below its rated voltage, the resistance of the Varistor is very high, essentially acting as an open circuit. As the applied voltage increases, the resistance of the Varistor begins to decrease until it reaches its minimum value. At this point, the Varistor is said to be "fully clamped". When the voltage is suddenly discharged, the Varistor will restore itself to its high impedance state. This property of the Varistor makes it highly suitable for surge protection applications, since it can act as a temporary "short" circuit when the voltage is above its rated voltage, and then reset itself back to a high impedance state after the event.

In conclusion, the ERZ-E07E201 varistor is a widely used MOV type of Varistor due to its wide voltage ratings range and very low leakage current. It is primarily used in consumer electronics, communications, and automotive applications for surge protection. Varistors are two-terminal, nonlinear passive devices that can provide surge protection for vulnerable electronic components. The Varistor changes its resistance drastically when a sufficient voltage is applied, and once the voltage reaches its rated breakdown voltage it will turn on and act as a surge protection. The Varistor will then reset itself back to a high impedance state once the voltage is discharged.

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