By Shape
Look for legs on the side: 1. Standard Signal - This is the regular forward-biased diode. 2. Zener - Operated in reverse-biased to hold a constant voltage 3. Small Signal - Used for applications with a much smaller current but with much more accuracy
Look for both legs under: 1. Light Emitting Diode - Emits a colored light based on the materials used internally 2. Photodiode - Captures photons to generate current 3. Infra-Red - Emits light at the infra-red spectrum 4. Varactor - A reverse-biased diode used as a capacitor 5. Schottky - Used for precision and when voltage needs to be conserved
Look for pins. These will be chips in the form of a SMD (surface mounted device). To identify these you will need to look at the number.
By Number
Rotate or read the number off the surface of the diode.
Go to alldatasheet.
Type the number in the search bar.
Determine the type from the results and even get the datasheet while doing it.
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