What is reference designator in Bom?
Reference designators are sequenced comments and instructions that pertain to a component. For example, you may have drawings that clarify the assembly process for certain components, or further instructions for the use of a large quantity of the same component.
Why are reference designations used?
A reference designator is used to identify a component within an electrical schematic or on a printed circuit board (PCB). It consists of one or two letters followed by numbers (e.g., C15, D10, J5, R18).
What is the reference designation of resistor?
A reference designator unambiguously identifies a component in an electrical schematic or on a printed circuit board. The reference designator usually consists of one or two letters followed by a number, e.g. R13, C1002….Standard Reference Designators.
| Designator | Component Type |
|---|---|
| R | Resistor |
| RN | Resistor network |
| RT | Thermistor |
| RV | Varistor |
What does CR mean on a circuit board?
CR often means ‘current rectifier’, translate diode.
What does C mean on a PCB?
For example, the letter R is a reference prefix for the resistors of an assembly, C for capacitors, K for relays.
What does L stand for on a PCB?
Circuit notation and reference designators
| More commonly used Circuit Schematic Reference Designators | |
|---|---|
| Reference Designator | Component Type |
| J | Connector jack (normally but not always refers to female contact) |
| L | Inductor |
| LS | Loudspeaker |
How do you identify circuit board components?
How to Identify Circuit Board Components
- Start by identifying the printed circuit board, or PCB.
- Identify other “nuts and bolts” electronic circuit components.
- Locate the circuit board’s battery, fuses, diodes and transistors.
- Locate the processor, or processors.
What is U on a PCB?
Reference designators are very simple: they are printed directly on the surface layer of the PCB to denote specific components. Here is a short list of reference designators on PCBs: U: Integrated circuits. R: Resistors. L: Inductors.
What does J stand for on a PCB?
What is Q on a PCB?
Q. Transistor (all types) R. Resistor.
What is R1 in PCB?
Additionally, what does SW mean on a circuit board? For example your PCB contains a label “R1” meaning the first resistor on the board, followed by the standard symbol for a resistor, followed by the value of the resistor; “10k” (10,000 ohms).