TMOV34S421MPX2696

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TMOV34S421MPX2696 is one of the many varieties of varistors and metal oxide varistors (MOVs) that are used in various electrical and electronic applications. These components act as transient voltage suppressors and are used to protect circuits from spikes in voltage caused by power surges, lightning strikes, or other electrical disturbances. The TMOV34S421MPX2696 has a voltage rating of 34V, a leakage current of 0.002mA and a surge response time of less than 2.5ns. It is available in a surface mount package with two leads.

Varistors, such as the TMOV34S421MPX2696, are made of semiconducting materials with a distinctive properties known as ‘non-linearity’. This means that the current passing through the device and the voltage across it are not directly proportional. The device has a characteristic curve, shown in Figure 1, where it can be seen that for low voltages, current remains constant. However, as the voltage begins to increase, the current increases exponentially.

Figure 1: Characteristic curve of the TMOV34S421MPX2696

When a transient voltage spike is applied to an electrical circuit, it typically carries a large amount of energy. Without a protection device, such as a MOV, this energy will be transferred through the circuit components and cause damage. The MOV is designed to absorb this energy and dissipate it before the voltage reaches a level that would damage the circuit.

The working principle for the TMOV34S421MPX2696 is based on its non-linear characteristic curve. When a voltage spike is applied to the MOV, it begins to conduct from a critically low voltage point which is dependent on its rating. This causes an increase in current, which causes an increase in voltage across the device. This voltage adds to the supply voltage, increasing it further until the device saturates, becoming highly conductive.This reduces the spikes voltage to a safe level, which in turn protects the circuit.

MOVs, such as the TMOV34S421MPX2696, are used in a wide variety of applications. They are used for transient overvoltage protection in automotive, lighting, telecommunications, and consumer electronics and also for other applications. The TMOV34S421MPX2696 in particular, is used in EMC filter designs, overvoltage protection, and secondary circuit protection circuits. It is also used in DC-DC converters, AC-DC adaptors, and powertrain control modules.

In summary, the TMOV34S421MPX2696 varistor is a non-linear device used to provide overvoltage protection in a range of applications. It works by quickly dissipating the energy of transient voltage spikes before they reach a level that is damaging to the circuit. The TMOV34S421MPX2696 can therefore help to protect a wide variety of components, allowing them to be used safely in power sensitive applications.

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