What's the difference between these three different ways of symbolising a generic rectifier diode: solid, outline and outline with connection between anode and cathode?
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1\$\begingroup\$ All 3 are in common use. \$\endgroup\$ – Peter Smith Jan 27 '20 at 17:01
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3\$\begingroup\$ Amount of ink spent. Third one is more suited for hand drawing with templates since you can keep a straight line and then go back over it with a stencil later \$\endgroup\$ – DKNguyen Jan 27 '20 at 17:03
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12\$\begingroup\$ the third one means "reverse protection diode I almost forgot when drawing this schematic" :) \$\endgroup\$ – FrancoVS Jan 27 '20 at 17:06
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6\$\begingroup\$ To me, the third symbol implies you've just dropped the diode on top of a wire, without breaking the wire, so there is a short circuit between the diode terminals. \$\endgroup\$ – Peter Bennett Jan 27 '20 at 17:30
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1\$\begingroup\$ You already have the correct answers, based on norms, but let me add this. I seem to remember that some textbook authors take the liberty to associate the filled and empty ones with different models of a diode. So, for example, one symbol can be used to represent an ideal diode with zero threshold and infinite V/I slope and another can represent a diode with fixed nonzero threshold and slope corresponding to rd, or the exponential model based on Shockley equation. Not a norm, not a shared use, just good all babel of self-imposed conventions. Just to teach, at the beginning. \$\endgroup\$ – Sredni Vashtar Jan 27 '20 at 21:07
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The filled symbol adheres to IEEE norms, the one with the line through it adheres to DIN/IEC norms, and the hollow one does not adhere to any norm.
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1\$\begingroup\$ Do you happen to have any links to more information about the DIN and IEC standards? I'd really like to educate myself about the differences between those and the IEEE standards. \$\endgroup\$ – Elliot Alderson Jan 27 '20 at 19:11
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1\$\begingroup\$ pcad-libs.embedders.org/rules/ref_617.pdf Section 5.3 (page 79 / 05-6 in that document) Sorry, offical norms are paylinks. \$\endgroup\$ – Janka Jan 27 '20 at 19:33
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All of those are standard diodes you can get details in 
the original image is from the site below : https://www.tubefr.com/types-de-diodes.html
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IEEE Std 315, Graphic Symbols for Electrical and Electronics Diagrams, specifies this symbol for a "Semiconductor diode; semiconductor rectifier diode; metallic rectifier"
The letters in parentheses are not part of the symbol, and the enclosing circle is optional. So, at least in the U.S., the hollow symbols would be non-standard.
answered Jan 27 '20 at 18:22
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They all indicate the same thing. Just a stylistic difference.
