Diode Coding

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Diode Coding :-

First letter - Semiconductor material

  • A Germanium
  • B Silicone
  • C Gallium arsenide, ect.
  • D Photodiodes, ect.


Second letter - Application


Third letter - In case of diodes for specialized applications, the third letter does not generally have any particular significance.


Zener diodes - have an additional letter after the numbers denoting the tollerance :-

  • +/- 1%
  • +/- 2%
  • +/- 5%
  • +/- 10%


Zener diodes also have additional characters which indicate the zener vltage e.g. 9V1 indicates 9.1V

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NOTE: All information contained within this article is pure opinion. Although this article is intended to help people, it may contain faulty or misleading information. This article is not to be considered professional opinion or advice, and is in no way a replacement for reading all safety/instructional documentation. Always remember to protect yourself when handling/using hazardous materials, as well as test new techniques before using them on projects/work intended to be handed in or used.

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