MOV-07D121KTR Circuit Protection

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TVS (Transient Voltage Suppressor) type varistors, also known as MOVs (Metal Oxide Varistors), are discrete device protection components used to limit excessive transient voltage levels. The MOV-07D121KTR is a surge-protective MOV, and it provides reliable surge protection for high-power electrical systems, ensuring safe operational conditions and increased system lifetime. In this article, we will discuss the application field and working principle of the MOV-07D121KTR varistor.

An MOV is a bidirectional semiconductor available in a variety of configurations. It is designed to absorb transient voltages, such as those generated by lightning strikes, electrostatic discharges, or power line disturbances. The MOV-07D121KTR is an ultra-low capacitance, self-healing varistor with an especially low leakage current of 0.001 μA at 5 V. Due to its wide capacitance range of 7 to 391 pF, it is particularly suitable for low-capacitance applications with high-current voltage transients.

MOV-07D121KTR varistors find their principal application in power electronics, home appliances, industrial systems, communication equipment, automotive systems, and medical electronic systems. As a surge-protective MOV, it provides reliable surge protection for high-power applications by minimizing damage to the protected circuit caused by transients with overvoltages and dV/dt. The device is also RoHS-compliant, with no lead or other types of hazardous materials used in its construction.

The MOV-07D121KTR works on the principle of non-linear electrical conduction to limit transient overvoltages. It employs a junction of zinc oxide grains, within which a small amount of an additive is blended, to reduce its electrical resistance. When the rated voltage is reached, the electrical resistance of the junction decreases, thus drawing a high current which absorbs the surge energy.

The MOV-07D121KTR has a high temperature rating of 85°C and a wide operating temperature range of -55°C to +85°C, making it suitable for use in most operating environments. Its peak pulse current is 7.07 kA (2/10 μs), marking it as an exceptionally reliable surge-protective varistor that will easily absorb large amounts of energy.

In addition, the device has an outstanding memory effect and is highly stable in operation, with no aging or memory loss. It also possesses a low thermal aging rate and, even under long-term operation at high temperatures, the varistor will not degrade, indicating that it is capable of withstanding long-term environmental stress.

The MOV-07D121KTR is also reliable during assembly and rework processes, with a solder heat sensitivity of only 215 °C, and its excellent long-term stability and leakages current make it ideal for ESD protection applications.

In conclusion, the MOV-07D121KTR is an indispensable device in a wide range of applications, where reliable surge protection is essential. The device is suitable for use in power electronics, home appliances, industrial systems, communication equipment, automotive systems, and medical electronic systems. It offers outstanding memory effect and long-term stability, in addition to its wide operating temperature range and low solder heat sensitivity. To summarize, the MOV-07D121KTR varistor is a reliable and durable device that provides excellent protection against transient voltages.

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