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Electronic symbol

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Common circuit diagram symbols (US symbols)

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.

Resistors

  • (a) American-style resistor, (b) rheostat (variable resistor), and (c) potentiometer (a) American-style resistor, (b) rheostat (variable resistor), and (c) potentiometer
  • (a) IEC-style resistor, (b) rheostat (variable resistor), and (c) potentiometer (a) IEC-style resistor, (b) rheostat (variable resistor), and (c) potentiometer
  • Thermistor Thermistor

Capacitors

Inductors

Sources

  • Single cell, multi-cell battery Single cell, multi-cell battery
  • Battery, multi-cell Battery, multi-cell
  • Voltage source Voltage source
  • Controlled voltage source Controlled voltage source
  • Current source Current source
  • Controlled current source Controlled current source
  • AC voltage source AC voltage source

Circuit Return

  • IEC-style ground (GND) symbol IEC-style ground (GND) symbol
  • Signal/Low noise ground (GND) symbol Signal/Low noise ground (GND) symbol
  • IEC-style chassis symbol IEC-style chassis symbol

Transistors

Unipolar

Bipolar

Diodes

Antennas

Vacuum tubes

Switches

  • Switch, Single Pole/Single Throw (SPST) Switch, Single Pole/Single Throw (SPST)
  • Switch, Single Pole/Double Throw (SPDT) Switch, Single Pole/Double Throw (SPDT)
  • Switch, Double Pole/Double Throw (DPDT) Switch, Double Pole/Double Throw (DPDT)
  • Momentary switch, make (IEEE Std 315) Momentary switch, make (IEEE Std 315)
  • Momentary switch, break (IEEE Std 315) Momentary switch, break (IEEE Std 315)
  • Momentary switch, two circuit (IEEE Std 315) Momentary switch, two circuit (IEEE Std 315)

Relays

  • American-style relays, SPST, SPDT, DPST, DPDT American-style relays, SPST, SPDT, DPST, DPDT
  • IEC relay symbol, SPDT IEC relay symbol, SPDT

Lamps

Current Limiters

Transformers

  • Transformer with center tap Transformer with center tap
  • Transformer with two secondary windings Transformer with two secondary windings
  • Current Transformer Current Transformer
  • Zero-Sequence Current Transformer (ZSCT) (a.k.a. window-type current transformer) Zero-Sequence Current Transformer (ZSCT) (a.k.a. window-type current transformer)
  • Bushing-Type Current Transformer Bushing-Type Current Transformer
  • Voltage Transformer Voltage Transformer

Acoustic Devices

Traces

  • IEC-style trace junction IEC-style trace junction
  • Trace crossing Trace crossing

Miscellaneous

See also

References

  1. Circuit Symbols for all Electronic Components. Talking Electronics, 2013. Retrieved 01 Apr 2015.

External links

Electronic components
Semiconductor
devices
MOS
transistors
Other
transistors
Diodes
Other
devices
Voltage regulators
Vacuum tubes
Vacuum tubes (RF)
Cathode-ray tubes
Gas-filled tubes
Adjustable
Passive
Reactive
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