WTS: Genuine 365nm Nichia NCSU033B UV leds

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Valor
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WTS: Genuine 365nm Nichia NCSU033B UV leds

For sale some original NCSU033BT, flux bin P9 UV leds. New-old-stock leftovers from a science project.
These are still selling for $50-75 a piece.

Asking $30 $20 per LED, plus shipping.

Economy Inernational shipping without tracking or insurance: $5
Inernational Shipping with tracking (preferred): $15

 

 

Some techdata:

Vf=3.6-4.0V
If=700mA
If(pulsed)=1000mA
Ir=85mA
PD=3.08D
Tj=130
λp=365
λd=9nm
Flux=350-390mW

 

cheers,

Val

 

update: now with techdata

Edited by: Valor on 02/27/2017 - 10:57
The Miller
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How do they compare to this LED?
http://www.gearbest.com/led-flashlights/pp_277704.html
for now $20 one gets a nice flashlight with it.

Jerommel
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Some specs would be nice.
Wavelength, Vf and maximum current.

Looking for:

5” parabolic reflector (for recoil light)

Valor
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I don’t know how they compare as I don’t have that light. The linked Convoy S2+ is apparently using a NCSU276A (I might be wrong) but that led costs less than half of what 033b are still selling for.

Could there be a spectral difference after all? I was told that the Nichias in those golden-ceramic packages with glass lens (i can’t find what the package is called) are made for prolonged life under industrial use.

Maybe some UV-savvy flashaholic fella could enlighten us.

I’m waiting for several hosts to arrive so I can test them outdoors.

RobertB
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There’s also the Nichia UV Jaxman with the filter for $47

Jerommel
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They look big.
Is it 5050 size?

Looking for:

5” parabolic reflector (for recoil light)

Valor
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Sorry, forgot to list them. I’ll update the listing

NCSU033B(T) P9
Vf=3.6-4.0V
If=700mA
If(pulsed)=1000mA
Ir=85mA
PD=3.08W
Tj=130
λp=365
λd=9nm
Flux=350-390mW

Valor
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The package is big, the die I think is 1×1mm
They should fit on XHP70 or MK-R boards

zak.wilson
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I’m not seeing P9 listed as a flux bin for the 033B. The highest flux bin listed is P34d22, which is 590-640mW at 500mA forward current. The lowest flux bin in the 276A is P35d21, which is 640-700mW at 500mA.

I know fairly little about UV LEDs, so I could easily be missing something obvious, but I don’t see an advantage to the 033B over the 276A.

Ceilingbounce – flashlight testing and runtime graphs for Android

Valor
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There seems to be multiple different editions of the NCSU033B(T) which I cant find a documentation for.
Googling after NCSU033B P9 350 ends up with few links to a datasheet with earlier binning nomenclature.

As for the objective differences between the NCSU033B and NCSU276A these are what I could find is:

  • NCSU033B has a slighly narrower beam profile 115° vs 130°
  • NCSU033B has a better thermal resistance 4.4°C/W vs 11°C/W
  • on the other hand NCSU276A has more raw output

I think these models are not a replacement to each other but rather a compliment.

It’s true that, there could be many applications where the 033B (or it’s bigger brothers sharing the same package size such as: NVSU333A, NC4U133B) would NOT fit the bill due to larger size and higher cost.

Nonetheless, consindering the constructive feedback I’ve received, I’ve readjusted the price.

The_Driver
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Thanks for offering these!
I’ll take one. Sent you a pm.

There is one very big difference between these and the newer Nichias:
These older ones have a central solder pad for heatsinking. This is important because UV LEDs are much more heat sensitive than white LEDs. They start to die at much lower temperatures.

The newer ones in turn are much more efficient and thus brighter (but only when they are kept cool).

Please check out this thread here (it’s in German). It shows what happens to the Nichia 276 when it gets too hot inside a Convoy S2+. My light also now has this problem :(.

Valor
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Sorry to hear about your problem.

Thanks for the link. You have a good point there: in addition to a better thermal resistance, the older package can obviously endure a noticeably higher junction temperature

NCSU033B NCSU0276A
Tj=130°C Tj=90°C
prisma
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I will take one also.

The Miller
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Nice thanks all for this educational thread
Scouring a high drain cell for NY S2+ Nichia now, if it fails I want one too!

Valor
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The Miller wrote:
… Scouring a high drain cell for NY S2+ Nichia now, if it fails I want one too!

I trully hope your S2+ UV Nichia does *NOT *fail. But I will reserve one NCSU033B for you in any case Wink

Lexel
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in the 40$ new price range you got a 233A
Tj is also 130°C

http://www.nichia.co.jp/specification/products/led/NVSU233A-E.pdf
lowest flux bin 800-870mW

for the 233 and 276A I can only recommend to get djozz custom board

http://budgetlightforum.com/node/48934

or if you are sick to get 5W 365nm get the 333A

http://www.nichia.co.jp/specification/products/led/NVSU333A-E.pdf
lowest flux bin 3160mW
has the same 7×7mm footprint with thermal pad

Valor
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Lexel wrote:
…or if you are sick to get 5W 365nm get the 333A
lowest flux bin 3160mW

I’ll try to get one for the fun of it Smile
Valor
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Received some copper and alu. boards for testing how these UV leds fit…

The universal base boards made for both XHP70 & MK-R seem to be a better match than the ones suitable for XHP50 & XHP70. Both are perfectly usable, nonetheless Thumbs Up

Serp
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I think there will be a short circuit. The center pad is too wide on the star

Valor
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Serp wrote:
I think there will be a short circuit. The center pad is too wide on the star

I thought so too, but considering that the solder bulges slightly up it worked without a problem. The led got pulled into it’s place once the solder started to flow.
I’ve had (the start) running yesterday without any issues. Then I decided to test the limits..

Valor
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The_Driver wrote:
Thanks for offering these! Please check out this thread here (it’s in German). It shows what happens to the Nichia 276 when it gets too hot inside a Convoy S2+. My light also now has this problem :(.

Hi again, your LED should be on it’s way to Germany as we speak.
I’ve run a test to see if these leds have the same issue..
After pushing the test-unit (the one on the DTP star) to 1.7A i had to stop the test, as I did not have proper isolation of the rest of the lab from UV bombardment.
The die seems unaffected. The star temperature reached around 56°C

djozz
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Those are pretty cool, and the combination with a readily available DTP board makes them interesting.
Tempted to buy one but $20 for one led, however good the price, still makes me think twice Wink !

Valor
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Djozz, cant you send me some translucent S2+ thingies, and i will send you one of these Smile

djozz
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Valor wrote:
Djozz, cant you send me some translucent S2+ thingies, and i will send you one of these Smile

That is too good a deal because I got those for free from Simon. But send me your address and you will get some anyway. (and that reminds me that someone else asked for a few of those as well, so I will have some shipping to do Smile )
The_Driver
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I just got mine today. Very fast shipping! Thanks!

Valor
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djozz, PM sent. I’ve ordered some S2+ hosts from GB for modding. Feel free to ship away any S2+ parts you don’t want to keep Big Smile

The_Driver, wow that was indeed fast. Any plans on how you are going to mount the LED into your host? I’ve modded a 348 with one of these where I just soldered the LED to a rectangular copper bar 2×3×6mm and then glued to the pill…

I’ve got some more playing to do with these today. Any wishes what one should do to a de-domed or, should I say “de-windowed” UV led? Evil

Valor
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Forgot to annotate the photo.
The small die on the anode side is apparently the ESD/TVS protection diode. That fella ensures that this expensive diode does not get zapped by the static. Ain’t that sweet…

djozz
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Thanks Valor, I will get you a few nice emitters for your S2+ Smile

Valor
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This will soon need it’s own separate thread Smile
I’ve had some time to prepare a test of the same led at 1700mA and leave it running overnight. The thermal performance looks very promising.
I’ve then had the led running at 2000mA for an hour and it stabilized at 79°C. That’s at 285% of datasheet figures.

The power usage seemed to remain uniform despite running warmer.

Voltage and current has been logged via an Agilent 34970A data acquisition unit. I’ve ordered a set of Omega K-type thermocouple to cover temerature in the logged data…

No visual deterioration either

prisma
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Mine arrived yesterday, thanks for yor fast shipping!

djozz
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That graph screems for added output data. I will see if I can add that (but no promises because it is hobby Wink ).

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