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Optocoupler technology

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IconicPCB:
I need some help in identifying optocoupler technology.
Some time ago i stumbled across an opto device whihc consists of LED source and a photo cell ( of the solar panel variety ) which can be used to:

a) provide isolation for the signal
b) provide low level power to the isolated circuit

I cant recall where or what the device is, I ask for any pointers to the device.

IconicPCB:
This was fast... dangerously fast...Thank You
Yes  this is the kind of device I was looking for.
 

digsys:
These were my favourite part - https://www.silabs.com/documents/public/data-sheets/Si844x.pdf   damn fast / logic
Not for new designs? Need to check if there is a replacement.

zitt:
What I want to know is why we don't see ever increasingly smaller optocouplers in SMT packages.

I don't remember now why I was looking; but I wanted something really small to work in an SMT design... sadly; I couldn't find anything really smaller than SO8. :( I was kind of hoping for some SC7 or hell even BGA style for the really small boards. I actually toyed with the idea of combining a photo transistor and smd right angle diode.

BravoV:
What coincidence , just used a VOM1271T + 2 beefy high voltage N mosfets to build a DIY SSR, really handy.  :-+

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