Electronics > Projects, Designs, and Technical Stuff
Need help to source some ~480nm smd LEDs, 0603, 0402 and one other strange type.
XOIIO:
Hello all, so I need to find some very small smd LED's in an ice blue sort of color, I was thinking cyan but that's a little too green from the look of it.
The first ones appear to be 0402, though my calipers measure them at 1mm x .8mm or so.
The next ones will likely be trickier however, they are side emitting ones, measuring 1.65mm x 1.3mm counting the lens, or 1.65mm x .93 not counting the lens.
The last ones are 1.6mm x 1.9mm with four legs, though are single color, I can't find anything like them in lists/examples of smd LED's however, so I'm hoping one of you may be able to tell me what the package type is.
https://imgur.com/a/sxlrtEE
All in all I'm not feeling great at my chances of finding such small led's in cyan as it seems to be quite rare, maybe due to just how small they can make that type of LED? (though blue seems more readily available).
I've checked digikey, mouser and ebay, but so far not much luck.
floobydust:
Cyan LED's are rare, keywords 495nm, 500nm, 505nm. They seem to be rejects of pure green//emerald green LED's 520-525nm.
I got some through-hole cyan LED's from eBay but no SMT anywhere.
I've only found blue-green phosphor-type SMT LED's, like VFD colour: https://www.eevblog.com/forum/projects/led-color-temperature-(smd-1206-0805)/msg1576420/#msg1576420
The 4-pin LED's are a bi-colour package, but you only have one die in there.
I can find "0606" 4-pin SMD 1.6x1.6mm nothing at 2mm. Unless a 4-pin 0805.
XOIIO:
--- Quote from: floobydust on June 20, 2018, 05:30:17 am ---Cyan LED's are rare, keywords 495nm, 500nm, 505nm. They seem to be rejects of pure green//emerald green LED's 520-525nm.
I got some through-hole cyan LED's from eBay but no SMT anywhere.
I've only found blue-green phosphor-type SMT LED's, like VFD colour: https://www.eevblog.com/forum/projects/led-color-temperature-(smd-1206-0805)/msg1576420/#msg1576420
The 4-pin LED's are a bi-colour package, but you only have one die in there.
I can find "0606" 4-pin SMD 1.6x1.6mm nothing at 2mm. Unless a 4-pin 0805.
--- End quote ---
Could be a 4 pin 0805, or that may at least fit, but yeah, I have gotten cyan colored LED's before by overdriving standard blue ones but that's tricky to do right and probably shortens the life considerably.
I realized I'm probably looking for more of an "ice blue" or 480nm ish led, though I've seen stuff advertised as cyan that looks close, I think that I have in mind is more in the blue range than that, but the ones in that post you linked look great too. I would probably have to get some of each and try them in person.
XOIIO:
Did some probing with a meter and looks like I'll need 2.8v led's, and those ones that might be dual color actually are, they are green which runs at .48v, and they also have red which just never gets used.
I may or may not change those, blue would be nice to match the theme but green for a battery indicator wouldn't be bad. I will need to use small ones though and not short out the other pin just to be safe in case they mapped it to a pin still for some reason.
ajb:
I ran into some "white" LEDs recently that I would certainly say could be called "ice blue". I think they were the Inolux HT-191TW. I threw them away when I saw how terrible they were as white, but they might work for your purposes. I tried to take a picture but can't really capture the color accurately.
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