Electronic component

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Various electronic components. Componentes.JPG
Various electronic components.

An electronic component is any basic discrete device or physical entity in an electronic system used to affect electrons or their associated fields. Electronic components are mostly industrial products, available in a singular form and are not to be confused with electrical elements, which are conceptual abstractions representing idealized electronic components and elements.

Contents

Electronic components have a number of electrical terminals or leads. These leads connect to other electrical components, often over wire, to create an electronic circuit with a particular function (for example an amplifier, radio receiver, or oscillator). Basic electronic components may be packaged discretely, as arrays or networks of like components, or integrated inside of packages such as semiconductor integrated circuits, hybrid integrated circuits, or thick film devices. The following list of electronic components focuses on the discrete version of these components, treating such packages as components in their own right.

Classification

Components can be classified as passive, active, or electromechanic. The strict physics definition treats passive components as ones that cannot supply energy themselves, whereas a battery would be seen as an active component since it truly acts as a source of energy.

However, electronic engineers who perform circuit analysis use a more restrictive definition of passivity. When only concerned with the energy of signals, it is convenient to ignore the so-called DC circuit and pretend that the power supplying components such as transistors or integrated circuits is absent (as if each such component had its own battery built in), though it may in reality be supplied by the DC circuit. Then, the analysis only concerns the AC circuit, an abstraction that ignores DC voltages and currents (and the power associated with them) present in the real-life circuit. This fiction, for instance, lets us view an oscillator as "producing energy" even though in reality the oscillator consumes even more energy from a DC power supply, which we have chosen to ignore. Under that restriction, we define the terms as used in circuit analysis as:

Most passive components with more than two terminals can be described in terms of two-port parameters that satisfy the principle of reciprocity—though there are rare exceptions. [2] In contrast, active components (with more than two terminals) generally lack that property.

Active components

Semiconductors

Transistors

Transistors were considered the invention of the twentieth century that changed electronic circuits forever. A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power.

Diodes

Conduct electricity easily in one direction, among more specific behaviors.

Various examples of Light-emitting diodes Verschiedene LEDs.jpg
Various examples of Light-emitting diodes

Integrated circuits

Integrated Circuits can serve a variety of purposes, including acting as a timer, performing digital to analog conversion, performing amplification, or being used for logical operations.

Programmable devices

Optoelectronic devices

Display technologies

Current:

Obsolete:

Vacuum tubes (valves)

A vacuum tube is based on current conduction through a vacuum (see Vacuum tube).

Optical detectors or emitters

Discharge devices

Obsolete:

Power sources

Sources of electrical power:

Passive components

Components incapable of controlling current by means of another electrical signal are called passive devices. Resistors, capacitors, inductors, and transformers are all considered passive devices.

Resistors

SMD resistors on the backside of a PCB Surface Mounted Device, soldered.jpg
SMD resistors on the backside of a PCB

Pass current in proportion to voltage (Ohm's law) and oppose current.

Capacitors

Some different capacitors for electronic equipment Verschiedene Kondensatoren 2.JPG
Some different capacitors for electronic equipment

Capacitors store and release electrical charge. They are used for filtering power supply lines, tuning resonant circuits, and for blocking DC voltages while passing AC signals, among numerous other uses.

Integrated passive devices

Integrated passive devices are passive devices integrated within one distinct package. They take up less space than equivalent combinations of discrete components.

Magnetic (inductive) devices

Electrical components that use magnetism in the storage and release of electrical charge through current:

Memristor

Electrical components that pass charge in proportion to magnetism or magnetic flux, and have the ability to retain a previous resistive state, hence the name of Memory plus Resistor.

Networks

Components that use more than one type of passive component:

Transducers, sensors, detectors

  1. Transducers generate physical effects when driven by an electrical signal, or vice versa.
  2. Sensors (detectors) are transducers that react to environmental conditions by changing their electrical properties or generating an electrical signal.
  3. The transducers listed here are single electronic components (as opposed to complete assemblies), and are passive (see Semiconductors and Tubes for active ones). Only the most common ones are listed here.

Antennas

Antennas transmit or receive radio waves

Assemblies, modules

Multiple electronic components assembled in a device that is in itself used as a component

Prototyping aids

Electromechanical

A quartz crystal (left) and a crystal oscillator 18MHZ 12MHZ Crystal 110.jpg
A quartz crystal (left) and a crystal oscillator

Piezoelectric devices, crystals, resonators

Passive components that use piezoelectric effect:

Microelectromechanical systems

Terminals and connectors

Devices to make electrical connection

Cable assemblies

Electrical cables with connectors or terminals at their ends

2 different miniature pushbutton switches Micro switch.jpg
2 different miniature pushbutton switches

Switches

Components that can pass current ("closed") or break the current ("open"):

Protection devices

Passive components that protect circuits from excessive currents or voltages:

Mechanical accessories

Other

Obsolete

Standard symbols

On a circuit diagram, electronic devices are represented by conventional symbols. Reference designators are applied to the symbols to identify the components.

See also

Related Research Articles

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<span class="mw-page-title-main">Amplifier</span> Electronic device/component that increases the strength of a signal

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<span class="mw-page-title-main">Transistor</span> Solid-state electrically operated switch also used as an amplifier

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<span class="mw-page-title-main">Photodiode</span> Converts light into current

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<span class="mw-page-title-main">Rectifier</span> Electrical device that converts AC to DC

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Electrical elements are conceptual abstractions representing idealized electrical components, such as resistors, capacitors, and inductors, used in the analysis of electrical networks. All electrical networks can be analyzed as multiple electrical elements interconnected by wires. Where the elements roughly correspond to real components, the representation can be in the form of a schematic diagram or circuit diagram. This is called a lumped-element circuit model. In other cases, infinitesimal elements are used to model the network, in a distributed-element model.

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<span class="mw-page-title-main">Varicap</span> Type of diode

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<span class="mw-page-title-main">Negative resistance</span> Property that an increasing voltage results in a decreasing current

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<span class="mw-page-title-main">Voltage regulator</span> System designed to maintain a constant voltage

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<span class="mw-page-title-main">Voltage multiplier</span>

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<span class="mw-page-title-main">Hybrid integrated circuit</span> Type of miniature electronic circuit

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<span class="mw-page-title-main">Electronic symbol</span> Pictogram used to represent various electrical and electronic devices or functions

An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit. These symbols are largely standardized internationally today, but may vary from country to country, or engineering discipline, based on traditional conventions.

<span class="mw-page-title-main">Electronic circuit</span> Electrical circuit with active components

An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow. It is a type of electrical circuit and to be referred to as electronic, rather than electrical, generally at least one active component must be present. The combination of components and wires allows various simple and complex operations to be performed: signals can be amplified, computations can be performed, and data can be moved from one place to another.

Passivity is a property of engineering systems, most commonly encountered in analog electronics and control systems. Typically, analog designers use passivity to refer to incrementally passive components and systems, which are incapable of power gain. In contrast, control systems engineers will use passivity to refer to thermodynamically passive ones, which consume, but do not produce, energy. As such, without context or a qualifier, the term passive is ambiguous.

The following outline is provided as an overview of and topical guide to electronics:

This glossary of electrical and electronics engineering is a list of definitions of terms and concepts related specifically to electrical engineering and electronics engineering. For terms related to engineering in general, see Glossary of engineering.

References

  1. For instance, a computer could be contained inside a black box with two external terminals. It might do various calculations and signal its results by varying its resistance, but always consuming power as resistance does. Nevertheless, it is an active component, since it relies on a power source to operate.
  2. Nonreciprocal passive devices include the gyrator (though as a truly passive component, this exists more in theoretical terms, and is usually implemented using an active circuit)—and the circulator, which is used at microwave and optical frequencies
  3. "13 Sextillion & Counting: The Long & Winding Road to the Most Frequently Manufactured Human Artifact in History". Computer History Museum . April 2, 2018. Retrieved 28 July 2019.
  4. Baker, R. Jacob (2011). CMOS: Circuit Design, Layout, and Simulation. John Wiley & Sons. p. 7. ISBN   978-1118038239.
  5. What is a Thermistor. U.S. Sensor Corp.