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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]
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.
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 ...
GE's MOV was new in 1972 and fortuitously I stumbled across an article by 4 General Electric R&D people that sets forth how you get from "metal oxide" to "polycrystalline diodes-in-bulk" better than anything I knew before. The ref is: Metal-oxide varistor: a new way to suppress transients."
A transient-voltage-suppression diode can respond to over-voltages faster than other common over-voltage protection components such as varistors or gas discharge tubes. The actual clamping occurs in roughly one picosecond, but in a practical circuit the inductance of the wires leading to the device imposes a higher limit. This makes transient ...
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.
A reference designator unambiguously identifies the location of a component within an electrical schematic or on a printed circuit board.The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15.
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