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SOP-4(ish)
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PlainName:
Looking at some optocouplers:

https://www.lcsc.com/products/Optocouplers-Phototransistor-Output_351.html

Specifically wanting a common SMD format which can be populated by multiple sources if necessary. So, SOP-4 looks reasonable and there's the list of 21 SOP-4 optocouplers. But half of them seem to be 2.54mm pitch and the other half 1.27mm pitch. They can't both be SOP-4, so which is really SOP-4? And what should the other lot be called?
DavidAlfa:
The first one is SOP-4 100mil, the 2nd one is just SOP-4.
Is it really that hard to google "Optocoupler packages" ?  ;)
https://www.vishay.com/docs/49633/sg2098.pdf
thm_w:
Better to always check and not assume anything, IMO.
SOIC has various widths, I would not assume if they said "SOIC" only that it meant wide or narrow. Even Vishay themselves just write "SOP4" in the datasheet title.
PlainName:

--- Quote ---Is it really that hard to google "Optocoupler packages" ?
--- End quote ---

Did that, hence the confusion of which is actually SOP-4 - the wide one seemed to be 'real' SOP-4 but you say it's the other one  :-//
PlainName:

--- Quote ---Better to always check and not assume anything, IMO.
--- End quote ---

Well, of course I would check the final choice, but knowing what to search for in order to make a choice that can be checked is part of the problem. Waste of time searching for the one I don't want :)
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