Components on PCBs are usually labelled using silkscreen markings and most of the markings seem to be quite intuitive:
- C?? – capacitor
- D?? – diode
- FB?? – ferrite bead
- J?? – jumper wire
- L?? – inductor
- LED?? – light emitting diode
- Q?? – transistor
- R?? – resistor
- RJ?? – RJxx connectors
- SW?? – switch
- T?? – magnetics (ex. for RJ45 connectors)
- TP?? – testpoint
- U?? – packaged integrated circuit
What could be the component marked as 'Y??' be? Unfortunately the board where I have this marking does not have this place populated.
[Edit] Wikipedia has a page about reference designators.
Best Answer
Y?? or X?? could both be a crystal or oscillator. Unfortunately there is no standard for this type of thing. If you posted a picture of the footprint we could take a better guess.
Also: Q=Transistor. RN=Resistor Network.