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Metal-oxide varistor manufactured by Siemens & Halske AG. Modern varistor schematic symbol, which is the same as a thermistor symbol [1]. A varistor (a.k.a. voltage-dependent resistor (VDR)) is a surge protecting electronic component with an electrical resistance that varies with the applied voltage. [2]
Surge Protection Device (SPD) for installation in a low-voltage distribution board. A surge protector (or spike suppressor, surge suppressor, surge diverter, [1] surge protection device (SPD), transient voltage suppressor (TVS) or transient voltage surge suppressor (TVSS)) is an appliance or device intended to protect electrical devices in alternating current (AC) circuits from voltage spikes ...
LDMOS (laterally-diffused metal-oxide semiconductor) [1] is a planar double-diffused MOSFET (metal–oxide–semiconductor field-effect transistor) used in amplifiers, including microwave power amplifiers, RF power amplifiers and audio power amplifiers. These transistors are often fabricated on p/p + silicon epitaxial layers.
3) If varistors are not designed for lightning protection, then why do varistor datasheets routinely specify numbers unique to lightning strikes (ie 8/20 microsecond pulses)? Varistors are for protection from lightning strikes and from other similar and lesser current pulses. But varistors are only one component of the application device.
Operation of a varicap. Holes are blue, electrons are red, depletion zone is white. The electrodes are at the top and bottom. Varactors are operated in a reverse-biased state, so no DC current flows through the device.
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A VMOS (/ ˈ v iː m ɒ s /) (vertical metal oxide semiconductor or V-groove MOS) transistor is a type of metal–oxide–semiconductor field-effect transistor . VMOS is also used to describe the V-groove shape vertically cut into the substrate material.
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