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Looking for Cheap, Ultra Fast LEDs (2-3ns)

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supperman:
I have found it very difficult to find LEDs with ultra-fast rise and fall times. The best I can find are by Vishay.

http://www.vishay.com/docs/84581/vsly3943.pdf

They have the right price point ($0.22 in low volume - DigiKey) and I can overdrive them to 2ns rise / fall with some fancy circuitry. But they are not ideal. I would rather go towards the visual range (650-850nm). And I would love to save money on the drive circuit by having a faster LED. I could also use a larger field of view.

The problem is it is very difficult to even search for these specs...

Any tips on how to search and find LEDs by rise and fall time? Only IR LEDs seem to list it on data sheets and most websites don't let you search on it (some luck with mouser). Low current is preferred because it is cheaper to overdrive them.

any tips greatly appreciated..

Marco:
Is the application really so price sensitive you can't use a laser diode?

If it has to be a LED I'd try to get the smallest blue LED you can find, probably 0201, and giving them a spin. Reducing size seems pretty much a necessity to speed up LEDs.

supperman:

--- Quote from: Marco on January 24, 2020, 05:44:17 pm ---Is the application really so price sensitive you can't use a laser diode?

If it has to be a LED I'd try to get the smallest blue LED you can find, probably 0201, and giving them a spin. Reducing size seems pretty much a necessity to speed up LEDs.

--- End quote ---

I'm moving a lot of data in a unique configuration.. so I will need at least 10+ sources.. so cost per unit is a factor. Also, cost of logic goes up as well as data rates per unit go up. I would prefer to stick with LEDs.. unless you know of a laser diode for $0.50 or so..

Marco:

--- Quote from: supperman on January 24, 2020, 06:42:29 pm ---unless you know of a laser diode for $0.50 or so..

--- End quote ---

China must have some sources, because they are selling modules with lenses for ~10 cents a piece.

PS. oh, I guess the really cheap ones can't really easily be PCB mounted. Cheapest TO18's seem more in 80 cent range.

moffy:
This is a nice article about driving a blue LED with 1-2ns rise times: https://arxiv.org/ftp/arxiv/papers/1011/1011.1954.pdf
Maybe some of the Broadcom HLMP devices would be suitable.

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