V120ZA4

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Varistors, MOVs, or transient voltage suppressors (TVS) are used to protect electrical equipment or a circuit from excessively high transient voltage, which may cause potential damage to the equipment or to the supply. The V120ZA4 is a type of TVS and is designed to protect against electrostatic discharge, as well as lightning. This article will discuss the application field and working principle of the V120ZA4.

The V120ZA4 is designed for use in applications where overvoltage transients are frequent and need to be protected against. Examples include sectors such as data communications, industrial, automotive, and military/aerospace. The device is designed to mitigate the effects of electrostatic discharges (ESD), lightning, and hot-switching transients. It has a fast response time of less than 1ns, is RoHS compliant, and is rated for a maximum peak pulse current of 2.5A.

The V120ZA4 is designed with a metal oxide varistor (MOV) and a reverse polarity diode connected in parallel. The MOV is used to protect against high-energy transients associated with ESD, lightning, and hot switching. It is a nonlinear device that absorbs the excess energy and dissipates it as heat. The diode is used to protect against reverse-polarity events, such as a power reversal or a voltage spike in the opposite direction.

The V120ZA4 is designed using a zinc oxide material, which has high-voltage and surge-current capabilities, high electrical insulation resistance, and excellent temperature stability. The device’s breakdown voltage is typically between 90V and 120V. Its capacitance is typically between 4pF and 6pF. The device is rated to dissipate up to 44W of power, and its operating temperature range is between -55°C and +85°C.

In operation, the V120ZA4 will begin to conduct current when the voltage across its terminals exceeds the device’s breakdown voltage. At this point, the device will shunt the current and clamp the voltage across its terminals. The current that passes through it is then dissipated as heat, which is then dissipated away from the device.

The V120ZA4 is a popular device in applications where protection from high-energy transients is necessary. It has a fast response time and is rated to dissipate a significant amount of power. Its capacitance is also low, which minimizes the effect of the device on the circuit\'s signal integrity. In addition, it is an economical solution and is available in a variety of packages.

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