Electronic symbol
An electronic symbol is a pictogram used to represent various electrical and electronic devices (such as wires, batteries, resistors, and transistors) in a schematic diagram of an electrical or electronic circuit. These symbols can (because of remaining traditions) vary from country to country, but are today to a large extent internationally standardized. Some symbols represent components (such as vacuum tubes) which ceased to be used routinely as newer technologies were introduced.
Standards for symbols
There are several national and international standards for graphical symbols in circuit diagrams, in particular:
- IEC 60617 (also known as British Standard BS 3939).
- ANSI standard Y32.2 (also known as IEEE Std 315).
- IEEE Std 91/91a: graphic symbols for logic functions (used in digital electronics). It is referenced in ANSI Y32.2/IEEE Std 315.
- Australian Standard AS 1102.
Different symbols may be used depending on the discipline using the drawing. For example, lighting and power symbols used as part of architectural drawings may be different from symbols for devices used in electronics. National and local variations to international standards also exist.
Gallery of common electronic symbols
Symbols shown are typical examples, not a complete list.[1]
Resistors
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(a) American-style resistor, (b) rheostat (variable resistor), and (c) potentiometer
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(a) IEC-style resistor, (b) rheostat (variable resistor), and (c) potentiometer
Capacitors
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Capacitor, polarized (American)
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IEC-style adjustable capacitors
Inductors
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Inductor with magnetic core (IEEE Std 315)
Sources
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Single cell, multi-cell battery
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Battery, multi-cell
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Voltage source
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Controlled voltage source
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Current source
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Controlled current source
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AC voltage source
Circuit Return
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Signal/Low noise ground (GND) symbol
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IEC-style chassis symbol
Transistors
Unipolar
Bipolar
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NPN darlington
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PNP darlington
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Diodes
Antennas
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Loop antenna (IEEE Std 315)
Vacuum tubes
Switches
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Switch, Single Pole/Single Throw (SPST)
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Switch, Single Pole/Double Throw (SPDT)
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Switch, Double Pole/Double Throw (DPDT)
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Momentary switch, make (IEEE Std 315)
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Momentary switch, break (IEEE Std 315)
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Momentary switch, two circuit (IEEE Std 315)
Relays
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American-style relays, SPST, SPDT, DPST, DPDT
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IEC relay symbol, SPDT
Lamps
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Indicating lamp (IEEE Std 315-1975)
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Light bulb
Current Limiters
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Moulded Case Circuit Breaker (MCCB)
Transformers
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Transformer with center tap
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Transformer with two secondary windings
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Current Transformer
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Zero-Sequence Current Transformer (ZSCT) (a.k.a. window-type current transformer)
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Bushing-Type Current Transformer
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Voltage Transformer
Acoustic Devices
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IEC-style microphone
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Microphone (IEEE Std 315)
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IEC-style buzzer
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Loudspeaker (IEEE Std 315)
Traces
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IEC-style trace junction
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Trace crossing
Miscellaneous
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Ferrite bead ring (IEEE Std 315)
See also
References
- ↑ Circuit Symbols for all Electronic Components. Talking Electronics, 2013. Retrieved 01 Apr 2015.
External links
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Wikimedia Commons has media related to Electrical symbols. |
- International standard IEC 60617 DB Graphical symbols for diagrams
- Electrical Schematic Symbols
- Collection of Open Source Electrical, Pneumatic, Hydraulic and Electronic Symbols
- Circuit Symbols of Electronic Components
- Electrical & Electronic Drawing Symbols
- Collection of Electronic Symbols
- Circuit Schematic Symbols
- Collection of Electrical and Electronic Schematic Symbols