There is also IEC 61131-3 – for ladder-logic symbols.
JIC JIC (Joint Industrial Council) symbols as approved and adopted by the NMTBA (National Machine Tool Builders Association). They have been extracted from the Appendix of the NMTBA Specification EGPl-1967.
ANSI Y32.2-1975 (also known as IEEE Std 315-1975[1] 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Australian Standard AS 1102 (based on a slightly modified version of IEC 60617; withdrawn without replacement with a recommendation to use IEC 60617).
The number of standards leads to confusion and errors.[2] 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.
Common electronic symbols
Symbols shown are typical examples, not a complete list.[3][4]
Traces
Wire crossover symbols for circuit diagrams. The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style symbol, which means the exact opposite. The newer, recommended style for 4-way wire connections in both CAD and non-CAD schematics is to stagger the joining wires into T-junctions. The large dot signifies an electrical connection.
For the symbols below: A and B are inputs, Q is output. Note: These letters are not part of the symbols.
There are variations of these logic gate symbols. Depending on the IC, the two-input gates below may have: 1) two or more inputs; 2) infrequently some have a second inverted Q output too.
For the symbols below: Q is output, Q is inverted output, E is enable input, internal triangle shape is clock input, S is Set, R is Reset (some datasheets use clear (CLR) instead of reset along the bottom).
There are variations of these flip-flop symbols. Depending on the IC, a flip-flop may have: 1) one or both outputs (Q only, Q only, both Q & Q); 2) one or both forced inputs along top & bottom (R only, S only, both R & S); 3) some inputs may be inverted.
Simple SR flip-flop (inverted S & R inputs)
Gated SR flip-flop
Gated D flip-flop (Transparent Latch)
Clocked D flip-flop (Set & Reset inputs)
Clocked JK flip-flop
Clocked T flip-flop
OpAmps
Note: The outside text isn't part of these symbols.
The shape of some electronic symbols have changed over time. The following historical electronic symbols can be found in old electronic books / magazines / schematics, and now considered obsolete.
Capacitors (historical)
All of the following are obsolete capacitor symbols.
^"IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters)," in IEEE Std 315-1975 (Reaffirmed 1993), vol., no., pp.i-244, 1993, doi:10.1109/IEEESTD.1993.93397.
^"Standards for Resistor Symbols". EePower. EETech Media. Retrieved September 13, 2021.
^"A4.11 Envelope or Enclosure". ANSI Y32.2-1975(PDF). The envelope or enclosure symbol may be omitted from a symbol referencing this paragraph, where confusion would not result
Further reading
Beginner's Guide to Reading Schematics; 4th Ed; Stan Gibilisco; McGraw-Hill, 224 pages; 2018; ISBN978-1260031119.
How to Read Electronic Circuit Diagrams; 2nd Ed; Brown, Lawrence, Whitson; Tab Books; 214 pages; 1988; ISBN978-0830628803.
How to Read Schematic Diagrams; 4th Ed; Donald Herrington; Sams Publishing; 160 pages; 1986; ISBN978-0672224577. (2nd Ed in 1967)
Engineer's Mini-Notebook : Schematic Symbols, Device Packages, Design and Testing; 1st Ed; Forrest M. Mims III; Radio Shack; 48 pages; 1988.
External links
Wikimedia Commons has media related to Electrical symbols.
IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters)
IEC 60617 : Graphical Symbols for Diagrams (2012) - International standard
MIL-STD-806B : Graphical Symbols for Logic Diagrams (1962) - U.S. DoD standard
January 07, 2023
electronic, symbol, electronic, symbol, pictogram, used, represent, various, electrical, electronic, devices, functions, such, wires, batteries, resistors, transistors, schematic, diagram, electrical, electronic, circuit, these, symbols, largely, standardized,. 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 Common circuit diagram symbols US ANSI symbols Contents 1 Standards for symbols 2 Common electronic symbols 2 1 Traces 2 2 Grounds 2 3 Sources 2 4 Resistors 2 5 Capacitors 2 6 Diodes 2 6 1 Bridge rectifiers 2 7 Inductors 2 8 Transformers 2 9 Transistors 2 9 1 Bipolar 2 9 2 Unipolar 2 10 Vacuum tubes 2 11 Switches 2 12 Relays 2 13 Lamps 2 14 Current limiters 2 15 Electro acoustic devices 2 16 Antennas 2 17 Cables 2 18 Connectors 2 19 ICs 2 19 1 Logic gates 2 19 2 Flip flops 2 19 3 OpAmps 2 20 Oscillators 2 21 Miscellaneous devices 3 Historical electronic symbols 3 1 Capacitors historical 4 See also 5 References 6 Further reading 7 External linksStandards for symbols EditThe graphic symbols used for electrical components in circuit diagrams are covered by national and international standards in particular IEC 60617 also known as BS 3939 There is also IEC 61131 3 for ladder logic symbols JIC JIC Joint Industrial Council symbols as approved and adopted by the NMTBA National Machine Tool Builders Association They have been extracted from the Appendix of the NMTBA Specification EGPl 1967 ANSI Y32 2 1975 also known as IEEE Std 315 1975 1 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 based on a slightly modified version of IEC 60617 withdrawn without replacement with a recommendation to use IEC 60617 The number of standards leads to confusion and errors 2 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 Common electronic symbols EditSymbols shown are typical examples not a complete list 3 4 Traces Edit Wire crossover symbols for circuit diagrams The CAD symbol for insulated crossing wires is the same as the older non CAD symbol for non insulated crossing wires To avoid confusion the wire jump semi circle symbol for insulated wires in non CAD schematics is recommended as opposed to using the CAD style symbol for no connection so as to avoid confusion with the original older style symbol which means the exact opposite The newer recommended style for 4 way wire connections in both CAD and non CAD schematics is to stagger the joining wires into T junctions The large dot signifies an electrical connection Trace connection IEC style Trace junction IEC style Trace crossing unconnected Trace crossing hand drawn schematics Grounds Edit The shorthand for ground is GND Optionally the triangle in the middle symbol may be filled in General ground IEC style Signal low noise ground the asterisk is not part of the symbol Chassis ground IEC style Sources Edit Battery single cell Battery multi cell Solar cell photovoltaic cell DC voltage source Controlled DC voltage source Current source Controlled current source AC voltage sourceResistors Edit See also Resistor It is very common for potentiometer and rheostat symbols to be used for many types of variable resistors including trimmers ANSI style a Resistor b Rheostat c Potentiometer Trimmer IEC style a Resistor b Rheostat c Potentiometer Trimmer Photoresistor ANSI Thermistor ANSI 5 Use t for NTC symbol Use t for PTC symbol Varistor ANSI Capacitors Edit See also Capacitor General capacitor IEC style Polarized capacitor American style Variable capacitor Ganged co moving variable capacitors IEC style Trimmer variable capacitorDiodes Edit See also Diode Optionally the triangle in these symbols may be filled in Note The words anode and cathode typically aren t part of the diode symbols Diode rectifier Schottky diode Zener diode Transient voltage suppression diode TVS Light emitting diode LED Photodiode Tunnel diode Varicap Shockley diode Silicon controlled rectifier SCR Diac may be a varistor in older schematics Constant current diode Opto isolator LED left photo transistor right Bridge rectifiers Edit See also Bridge rectifier There are many ways to draw a single phase bridge rectifier symbol Some show the internal diode circuit some don t Bridge rectifier Bridge rectifier Bridge rectifier Bridge rectifier Three phase bridge rectifierInductors Edit See also Inductor Air core inductor IEC style Magnetic core inductor IEEE style Tapped inductor IEC style Ferrite bead IEEE style Transformers Edit See also Transformer Transformer Transformer with center tap on secondary winding right side Transformer with two secondary windings right side Current transformer Zero sequence current transformer ZSCT also known as a window type current transformer Bushing type current transformer Voltage transformerTransistors Edit See also Transistor Optionally transistor symbols may include a circle 6 Note The pin letters B C E and G D S aren t part of the transistor symbols Bipolar Edit See also Bipolar junction transistor NPN bipolar junction transistor BJT PNP bipolar junction transistor BJT NPN Darlington transistor PNP Darlington transistorUnipolar Edit See also Field effect transistor N channel junction gate field effect transistor JFET P channel junction gate field effect transistor JFET Metal oxide semiconductor field effect transistor MOSFET Enhancement mode N channel MOSFET Enhancement mode P channel MOSFETVacuum tubes Edit See also Vacuum tube Vacuum tube diode Vacuum tube triode Vacuum tube tetrode pin letters are not part of the symbol Vacuum tube pentodeSwitches Edit See also Switch Pushbutton normally open push to make horizontal line on top Pushbutton normally open push to make IEEE style Pushbutton normally closed push to break IEEE style Pushbutton normally closed two circuits IEEE style Switch 1P1T SPST single pole single throw Switch 1P2T SPDT single pole double throw Switch 2P1T DPST double pole single throw Switch 2P2T DPDT double pole double throw Slide switch 1P3T break before make nonshorting style Slide switch 1P4T break before make nonshorting style Slide switch 1P4T make before break shorting style Rotary switch 1P3T break before make nonshorting style Rotary switch 1P4T break before make nonshorting style Rotary switch 1P4T make before break shorting style Reed switch normally openRelays Edit See also Relay Note The pin letters aren t part of the symbols SPST SPDT DPST DPDT relays American style SPDT relay IEC style Lamps Edit LED is located in diode section Neon lamp Indicating lamp IEEE style Incandescent lamp Incandescent light bulb as an indicator Light bulbCurrent limiters Edit IEC fuse b equivalent symbols a c IEEE Std 315 1975 Moulded case circuit breaker MCCB Fuse IEC top and American lower two Electro acoustic devices Edit Loudspeaker IEEE style Buzzer IEC style Microphone IEEE style Microphone IEC style Antennas Edit See also Antenna radio General antenna IEC style Dipole antenna IEC style Loop antenna IEC style Loop antenna IEEE style Cables Edit See also Electrical cable Cable Shielded 1 conductor Cable 2 conductor Cable Shielded 2 conductor with shield connected to ground Cable 5 conductor Cable Shielded 5 conductorConnectors Edit See also Electrical connector TRS phone jacksICs Edit See also Integrated circuit Logic gates Edit See also Logic gates For the symbols below A and B are inputs Q is output Note These letters are not part of the symbols There are variations of these logic gate symbols Depending on the IC the two input gates below may have 1 two or more inputs 2 infrequently some have a second inverted Q output too Buffer Inverter NOT AND NAND OR NOR XOR XNORThe above logic symbols may have additional I O variations too 1 schmitt trigger inputs 2 tri state outputs 3 open collector or open drain outputs not shown Buffer gate with schmitt trigger input Buffer gate with tri state output control B is the tri state control Flip flops Edit See also Flip flops For the symbols below Q is output Q is inverted output E is enable input internal triangle shape is clock input S is Set R is Reset some datasheets use clear CLR instead of reset along the bottom There are variations of these flip flop symbols Depending on the IC a flip flop may have 1 one or both outputs Q only Q only both Q amp Q 2 one or both forced inputs along top amp bottom R only S only both R amp S 3 some inputs may be inverted Simple SR flip flop inverted S amp R inputs Gated SR flip flop Gated D flip flop Transparent Latch Clocked D flip flop Set amp Reset inputs Clocked JK flip flop Clocked T flip flopOpAmps Edit Note The outside text isn t part of these symbols Operational amplifier opamp ComparatorOscillators Edit See also Electronic oscillator Crystal oscillator IEEE style Ceramic resonator 3 pins Miscellaneous devices Edit Hall effect sensor Gas discharge tubes GDT for ESD discharge Spark gapfor ESD dischargeHistorical electronic symbols EditThe shape of some electronic symbols have changed over time The following historical electronic symbols can be found in old electronic books magazines schematics and now considered obsolete Capacitors historical Edit All of the following are obsolete capacitor symbols Obsolete capacitor very old style Obsolete capacitor Obsolete capacitor Obsolete capacitor Obsolete capacitorSee also Edit Electronics portalCircuit diagram Reference designator Symbols for appliance classesReferences Edit IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams Including Reference Designation Letters in IEEE Std 315 1975 Reaffirmed 1993 vol no pp i 244 1993 doi 10 1109 IEEESTD 1993 93397 Guidelines for Drawing Schematics Circuit Symbols for all Electronic Components Talking Electronics 2013 Retrieved 01 Apr 2015 Electrical Symbols amp Electronic Symbols RapidTables 2012 Retrieved 17 April 2016 Standards for Resistor Symbols EePower EETech Media Retrieved September 13 2021 A4 11 Envelope or Enclosure ANSI Y32 2 1975 PDF The envelope or enclosure symbol may be omitted from a symbol referencing this paragraph where confusion would not resultFurther reading EditBeginner s Guide to Reading Schematics 4th Ed Stan Gibilisco McGraw Hill 224 pages 2018 ISBN 978 1260031119 How to Read Electronic Circuit Diagrams 2nd Ed Brown Lawrence Whitson Tab Books 214 pages 1988 ISBN 978 0830628803 How to Read Schematic Diagrams 4th Ed Donald Herrington Sams Publishing 160 pages 1986 ISBN 978 0672224577 2nd Ed in 1967 Engineer s Mini Notebook Schematic Symbols Device Packages Design and Testing 1st Ed Forrest M Mims III Radio Shack 48 pages 1988 External links Edit Wikimedia Commons has media related to Electrical symbols IEEE Standard American National Standard Canadian Standard Graphic Symbols for Electrical and Electronics Diagrams Including Reference Designation Letters IEC 60617 Graphical Symbols for Diagrams 2012 International standard MIL STD 806B Graphical Symbols for Logic Diagrams 1962 U S DoD standard Retrieved from https en wikipedia org w index php title Electronic symbol amp oldid 1131678475, wikipedia, wiki, book, books, library,
