Diode: labelled reference, US style

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Diode: labelled reference, US style, sheet 1 of 1

  1. Fig. 1

    AK

    Diode

    A diode conducts much more readily in its forward direction than in its reverse direction. Real devices also have leakage and reverse breakdown, which this page's simplified models omit.

  2. Fig. 2

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    Light-emitting diode

    Two arrows leaving the diode body mark a light-emitting diode.

  3. Fig. 3

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    Zener diode

    Bent ends on the cathode bar mark a Zener diode, a diode meant to be used in reverse breakdown.

  4. Fig. 4

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    Schottky diode

    Hooked ends on the cathode bar mark a Schottky diode.

  5. Fig. 5

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    Photodiode

    Two arrows arriving at the diode body mark a photodiode.

Terminal key
Fig.TerminalsWhat the terminal is
1–5AThe anode (A) is the terminal opposite the bar. During forward conduction, conventional current enters the diode at the anode.
1–5KThe cathode (K) is the terminal at the bar. During forward conduction, conventional current leaves the diode at the cathode.

Sources

  1. ModEL — PN Junctions and Diodes, §§2.3–2.7 (bias and diode variants), Tony R. Kuphaldt, retrieved 2026-09-22
  2. Diodes — terminal polarity, ideal and offset models (pp. 1–2, 7–10), MIT OpenCourseWare — Chaniotakis and Cory, retrieved 2026-09-22
  3. Lessons In Electric Circuits, Vol. V — §9, Circuit Schematic Symbols (pp. 130–139), Tony R. Kuphaldt, retrieved 2026-09-22
Name
Class
Date
Sheet
1 of 1
Drawing
Diode Labelled reference
Style
US style
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circuitsymbols.com
Licence
CC BY 4.0