V27MA1A

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TVS – Varistors, MOVs are two of the main protection devices used to secure electronic devices against transient voltage spikes. The V27MA1A application field and working principle are suited to this type of protection device, and this article will go on to discuss the main features of the V27MA1A.

This particular device is a two-terminal thermally protected varistor designed for overvoltage and lightning protection. The V27MA1A application field covers such areas as I/O interfaces, MCUs, and DSPs, as well as automotive, telecom, and consumer electronics. It is even suitable for use in medical devices.

The V27MA1A has the ability to reduce the surges of electrostatic discharge (ESD), and electromagnetic wave radiation. Its response time is typically under 6 nanoseconds. This device has a multilayer structure, with a current resistance that limits the low frequency ESD. Its alternating current (AC) working voltage is between 6V and 320V, while its peak pulse current capability is between 0.5A and 7A.

The V27MA1A also has a patented metal oxide varistor with a low parasitic inductance capacitor circuit which contains a thermal fuse. This patent ensures that the device is able to absorb the energy of the spike and dissipate it, while still maintaining the normal operating voltage of the electrical device. The thermal fuse is designed to be self-breaking, so it can automatically disconnect the power of the device upon excessive heat and while preventing any fire hazard.

To determine the type of device that is suitable for the particular application, the peak pulse clamping voltage should be considered. It is the maximum voltage that the protection device will hold, i.e. the energy of the spike can be absorbed. This can usually be determined by the peak pulse current, which is equal to the multiplication of the surge voltage and the protection device capacitance.

The working principle of the V27MA1A is the same as that of any other varistor. The voltage changes in the device cause the metal-oxide component to become a conductor, thus creating a surge current path. This creates a so-called “clamping voltage” which absorbs the energy of the spike and dissipates it. The thermal fuse then further limits the current. In addition, the combination of the varistor and the fuse provide a high resistance to over current, so the device will be able to stay in operation in the event of a surge.

The V27MA1A application field is highly versatile and can be used in a variety of electronics products, including automotive, telecom, and consumer electronics, as well as medical devices. Its patented design ensures its ability to reduce electrostatic discharge and wave radiation, and to provide effective protection against voltage spikes. Its thermal fuse further prevents any risk of overcurrent. Finally, its peak pulse clamping voltage should be appropriately considered when choosing a device for the required application.

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