Reference designator
From Wikipedia, the free encyclopedia
A reference designator uniquely idenitifies 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.
[edit] Legends
The construction of reference designators is covered by IEC 61346. The table below lists designators commonly used, and may not compy 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 | Ferrite bead |
| FD | Fiducial |
| J | Jack connector (female) |
| 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 |
| TP | Test point |
| U | Integrated circuit |
| X | Transducer not matching any other category |
| Y | Crystal or oscillator |
[edit] External Links
IEC 61346 Industrial systems, installations and equipment and industrial products — Structuring principles and reference designations
