VDRS14T320BSE

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TVS (transient voltage suppressors) devices like varistors, MOVs (metal oxide varistors) have been essential components used in the industry to help protect electronic components and integrated circuits from overvoltage caused by a surge in power lines or current. The VDRS14T320BSE is an example of an application field which is part of the industrial application circuit design.

The VDRS14T320BSE is part of the STMicroelectronics’ multilayer ceramic varistor family of devices, that are now being widely used in the industry to protect against voltage spikes, overvoltage, ESD (electrostatic discharge) and other electrical transients created as a result of lightning, load switching, and other unwanted occurrences.

The VDRS14T320BSE is a single layer, plate-type, 4-terminal varistor, and offers a peak surge dissipation of 320 Joules. The varistor is designed to work with a clamping voltage of 14V and can absorb currents up to 2.5KA (8/20 μs) for a given pulse time. The device also features a low thermal resistance of 1.3 K/W and a low leakage current of 1μA (max).

This varistor is typically used in application fields like white goods, home-appliance, telecommunications, notebooks, and other consumer electronics where overvoltage protection is essential as mentioned above. In addition, it is suitable for EMC, RFI (radio frequency interference), and DC test equipment.

The VDRS14T320BSE works through the following principle. When a voltage surge occurs, it creates an Alternating Current (AC) flow that makes the device’s semiconductor material to deform. This deformation produces changes in the VDRS14T320BSE characteristics like resistance and capacitance. This changes can be used to create a voltage limiting effect in order to absorb the energy of the surge.

The concept is relatively simple and is based on the Faraday’s law, which states that a changing magnetic field generates an electric field. This voltage limitation function is achieved by controlling the current flow through the use of an internal resistance. As a result, the energy of the voltage surge is dissipated, while the current is limited.

The VDR series devices from STMicroelectronics are widely used in the industry to provide reliable protection against transient voltage spikes. Thanks to its peak surge dissipation capability and low thermal resistance, these devices are well-suited for overvoltage protection requirements in various consumer and industrial applications fields.

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