SMOV34S511MP

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TVS (Transient Voltage Suppressors) and MOVs (Metal-Oxide Varistors) are essential components in any electronic system. The SMOV34S511MP is a product manufactured by Littelfuse that combines these two components in a single package, enabling designers to better protect their systems against external transient overvoltage threats. This article will discuss the application fields and working principles of this product.

Application Fields and Support Conditions

The SMOV34S511MP is designed to protect sensitive electronic components from damage caused by hazardous overvoltage situations. Typical applications include small signal, telecom, industrial and automotive applications. The product can also be used in portable consumer electronics such as laptops, mobile phones, and PDAs.

The product provides surge protection for systems operating between 4 and 8000V and works best within the temperature range of -40 to +85°C. It also provides a nominal protection voltage of 5.11V, making it suitable for applications with working voltages around that range. The product also offers a maximum peak pulse current rating of 12.5A, making it ideal for protecting systems from current surges.

Working Principles

The SMOV34S511MP consists of a Metal-Oxide Varistor (MOV) and a Transient Voltage Suppressor (TVS) integrated into a single package. The MOV is responsible for suppressing high frequency transients, while the TVS is employed to reduce the amplitude of both fast and slow-rising transients. Here is how the product works:

When an overvoltage surge occurs, the MOV is activated and conducts electricity quickly over the junctions of its components. This, in turn, results in a rise in the voltage at the MOV’s terminals, which is known as the clamping voltage. The clamping voltage is always several times higher than the nominal protection voltage of the device. Once the MOV has conducted its charge, its junctions return to a low resistance zone, effectively “clipping” the overvoltage surge.

The TVS then takes over to dampen the transient. It is a single-diode structure with an internal zener diode which is designed to limit the amplitude of both fast- and slow-rising transients. The zener diode is activated once the overvoltage surge reaches the specified clamping voltage. The zener diode then absorbs all the energy beyond the specified clamping voltage, leaving the protected system safe from harm.

Conclusion

The SMOV34S511MP is an ideal product to protect a system from overvoltage surges and transients. It is designed for small signal, telecom, industrial and automotive applications operating between 4 and 8000V, and offers a maximum peak pulse current rating of 12.5A. The device consists of a Metal-Oxide Varistor (MOV) and a Transient Voltage Suppressor (TVS), both of which are used together to provide a more complete overvoltage protection solution.

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