A black rectangular SMD component near an LED driver circuit's input has a white stripe on one edge, and the board is marked with a D. What is this component and its polarity?
Diode; stripe is the Cathode (-)
The board marking 'D' is the reference designator for a diode, so the component is a diode.
On an SMD diode the printed band or stripe on the body marks the cathode terminal, the negative end where conventional current exits when the diode conducts.
So the striped edge is the cathode (-), which fixes the diode's orientation in the LED driver input circuit.
Hence, the answer is Diode; stripe is the Cathode (-).
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In SMD IC packages, the full form of DIP is:
SMD stands for
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The solvent used for cleaning of a PCB is:
