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[edit]

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[edit]

Symbols shown are typical examples, not a complete list.[1]

Resistors[edit]

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

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

Capacitors[edit]

Inductors[edit]

Sources[edit]

  • Single cell, multi-cell battery

  • Battery, multi-cell

  • Voltage source

  • Controlled voltage source

  • Current source

  • Controlled current source

  • AC voltage source

Circuit Return[edit]

  • IEC-style ground (GND) symbol

  • Signal/Low noise ground (GND) symbol

  • IEC-style chassis symbol

Transistors[edit]

Unipolar[edit]

Bipolar[edit]

Diodes[edit]

Antennas[edit]

Vacuum tubes[edit]

Switches[edit]

  • Switch, Single Pole/Single Throw (SPST)

  • Switch, Single Pole/Double Throw (SPDT)

  • Switch, Double Pole/Double Throw (DPDT)

  • Momentary switch, make (IEEE Std 315)

  • Momentary switch, break (IEEE Std 315)

  • Momentary switch, two circuit (IEEE Std 315)

Relays[edit]

  • American-style relays, SPST, SPDT, DPST, DPDT

  • IEC relay symbol, SPDT

Lamps[edit]

Current Limiters[edit]

Transformers[edit]

  • Transformer with center tap

  • Transformer with two secondary windings

  • Current Transformer

  • Zero-Sequence Current Transformer (ZSCT) (a.k.a. window-type current transformer)

  • Bushing-Type Current Transformer

  • Voltage Transformer

Acoustic Devices[edit]

Traces[edit]

  • IEC-style trace junction

  • Trace crossing

Miscellaneous[edit]

See also[edit]

References[edit]

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

External links[edit]

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