Electronic symbol

Common circuit diagram symbols (US symbols)

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.

Standards for symbols

The graphic symbols used for electrical components in circuit diagrams are covered by national and international standards, in particular:

  • IEC 60617 (also known as British Standard BS 3939).
  • ANSI Y32.2-1975 (also known as IEEE Std 315-1975 or CSA Z99-1975)
  • 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. (Withdrawn without replacement)

Symbols usage is sometimes unique to engineering disciplines and national or local variations to international standards exist. For example, lighting and power symbols used as part of architectural drawings may be different from symbols for devices used in electronics.

Symbols shown are typical examples, not a complete list.[1][2]

Traces

Circuit return

Sources

Resistors

Capacitors

Inductors

Transistors

Unipolar

Bipolar

Diodes

Antennas

Vacuum tubes

Switches

Relays

Lamps

Current limiters

Transformers

Electro-acoustic devices

Miscellaneous devices

The shape of electronic symbols have changed over time. Some symbols were more prevalent in some countries. The following are historic electronic symbols that might be found in old electronic books and schematics.

Capacitors (historical)

See also

References

  1. ↑ Circuit Symbols for all Electronic Components. Talking Electronics, 2013. Retrieved 01 Apr 2015.
  2. ↑ Electrical Symbols & Electronic Symbols. RapidTables, 2012. Retrieved 17 April 2016.
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