A reference designator unambiguously identifies a component in an electrical schematic (circuit diagram) or on a printed circuit board (PCB). The reference designator usually consists of one or two letters followed by a number, e.g. R13, C1002. The number is sometimes followed by a letter, indicating that components are grouped or matched with each other, e.g. R17A, R17B.
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Legends
The construction of reference designators is covered by IEEE 200-1975/ANSI Y32.16-1975[1] (replaced by ASME Y14.44-2008[2]) and IEEE-315-1975[3]. The table below lists designators commonly used, and does not comply with the standard.
| Designator | Component Type |
|---|---|
| AT | Attenuator |
| BR | Bridge rectifier |
| BT | Battery |
| C | Capacitor |
| CN | Capacitor network |
| D | Diode (including zeners, thyristors and LEDS) |
| DL | Delay line |
| DS | Display |
| F | Fuse |
| FB or FEB | Ferrite bead |
| FD | Fiducial |
| J | Jack connector (female) |
| JP | Link (Jumper) |
| K | Relay |
| L | Inductor |
| LS | Loudspeaker or buzzer |
| M | Motor |
| MK | Microphone |
| MP | Mechanical part (including screws and fasteners) |
| P | Plug connector (male) |
| PS | Power supply |
| Q | Transistor (all types) |
| R | Resistor |
| RN | Resistor network |
| RT | Thermistor |
| RV | Varistor |
| S | Switch (all types, including push-buttons) |
| T | Transformer |
| TC | Thermocouple |
| TUN | Tuner |
| TP | Test point |
| U | Integrated circuit |
| V | Vacuum Tube |
| VR | Variable Resistor (potentiometer or rheostat) |
| X | Transducer not matching any other category |
| Y | Crystal or oscillator |
References
- ^ Standard Reference Designations for Electrical and Electronics Parts and Equipments: IEEE 200-1975 (Reaffirmed 1988): Section 4.1.5.3 (2). IEEE and ANSI, New York, NY. 1975. http://www.google.com/search?hl=en&q=ieee-200-1975.
- ^ Reference Designations for Electrical and Electronics Parts and Equipment: ASME Y14.44-2008 (Replaced IEEE 200-1975). ASME, Fairfield, NJ. 2008. http://catalog.asme.org/Codes/PrintBook/Y1444_Reference_Designations.cfm.
- ^ Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Letters): IEEE-315-1975 (Reaffirmed 1993): Section 22. IEEE and ANSI, New York, NY. 1993. http://www.google.com/search?hl=en&q=ieee-315-1975.
External links
- IEC 61346 (Withdrawn standard in 2009 and replaced by IEC 81346) Industrial systems, installations and equipment and
industrial products — Structuring principles and reference designations
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