VDRS20W175BSE

TVS (Transient Voltage Suppressors) devices are among the most versatile components in the electrical industry, providing an efficient and effective way of dissipating over-voltage lightning conditions. Among these TVS devices are Varistors, MOVs (Metal Oxide Varistors) and VDRs (Voltage Dependent Resistor or Transzorb). This article will focus on VDRs and will examine more closely the key features, application fields and working principles of the VDRs 20W175BSE.

The VDRs 20W175BSE are mainly designed for the protection of circuits operating on small battery or on the AC power line against the harm of over-voltage conditions. These components are particularly useful not only for protecting electronic circuits but also for preventing secondary circuit breakdowns caused by even small over-voltage transients. The key features of VDRs 20W175BSE are their low dynamic capacitance, their small package sizes, their wide operating temperature range, along with their low leakage current and their low capacitance derating.

The most common application fields of VDRs 20W175BSE are in industrial control systems, in telecommunications and satellite systems, and in power supply circuits. These components are particularly suitable for use in motor control, automotive systems, and high power voltage contactors. VDRs 20W175BSE are also used to reduce the severity of impulse transients on the power line, and can be used to protect power supplies, DC converters, and circuits affected by lightning or static charge-induced transient overvoltages. Furthermore, VDRs 20W175BSE are also used in oscillator circuits, as their low leakage current allows them to maintain better isolation between the collector and emitter.

The VDRs 20W175BSE work by clamping or suppressing voltages, allowing them to absorb energy from an over-voltage transient pulse. This is achieved through using negative temperature coefficient semiconductor technology, which is specifically designed for high voltage clamping and transient protection applications. This technology involves the use of a positive temperature coefficient material, which when exposed to an over-voltage transient will begin conducting, thereby dissipating the impulse energy.

The VDRs 20W175BSE also employ a mechanism of semi-conductive material interspersed between two opposed conductors, which is what creates the negative temperature coefficient. This semiconductor material is specially designed to be resistant to electrical stresses. This ensures that the device can conduct energy efficiently, thus offering protection even at higher frequencies. Once the energy has been dissipated, the positive temperature coefficient then returns the device to its original state hence why it is used for transient overvoltage protection.

Overall, the VDRs 20W175BSE provides an important protection against harmful over-voltage transients, controlled by its negative temperature coefficient and semi-conductive material between two ended conductors. These components are commonly used in a range of industrial applications, such as motor controls, automatic transmissions, automotive systems, power supplies, and oscillators. As well as providing excellent protection from over-voltage transients, the VDRs 20W175BSE also offer low dynamic capacitance, small package size, and low leakage current.