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Difficulty: EasyDiodes

On the cylindrical casing of a standard axial-lead semiconductor diode, what feature is identified by the painted stripe or band near one of the ends?

  1. The cathode terminalAnswer
  2. B
    The anode terminal
  3. C
    The nominal resistance rating in ohms
  4. D
    The maximum operating alternating current (AC) frequency

Answer

The cathode terminal
On standard through-hole axial diodes, the painted stripe marks the cathode terminal. In schematic diagrams, this corresponds to the vertical bar toward which the triangle points.

Step-by-Step Solution

1
Identify the standard packaging markings used on axial-lead semiconductor diodes.
Standard cylindrical diodes (such as the 1N4001 series) use a single painted band at one end to distinguish polarity.
Because diodes are polarized components that conduct current primarily in one direction, physical orientation must be identifiable.
2
Correlate the physical stripe with the corresponding electronic terminal.
The stripe aligns with the cathode (negative lead during forward conduction), matching the vertical bar in the standard schematic symbol.
Correct alignment ensures the diode is wired in forward bias rather than accidental reverse bias.

Key Concept

Physical diode lead identification and polarity marking
Estimated Time:45s
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Diodes

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