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 115Ā° vs 130Ā°
NCSU033B has a better thermal resistance 4.4Ā°C/W vs 11Ā°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.
Itās true that, there could be many applications where the 033B (or itās 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 Iāve received, Iāve readjusted the price.
Thanks for offering these!
Iāll 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 (itās 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 :(.
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
table(table#posts).
|NCSU033B|NCSU0276A|
|Tj=130Ā°C|Tj=90Ā°C|
Received some copper and alu. boards for testing how these UV leds fitā¦
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 :+1:
I thought so too, but considering that the solder bulges slightly up it worked without a problem. The led got pulled into itās place once the solder started to flow.
Iāve had (the start) running yesterday without any issues. Then I decided to test the limitsā¦
Hi again, your LED should be on itās way to Germany as we speak.
Iāve run a test to see if these leds have the same issueā¦
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 56Ā°C
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 !
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 )
djozz, PM sent. Iāve ordered some S2+ hosts from GB for modding. Feel free to ship away any S2+ parts you donāt want to keep
The_Driver, wow that was indeed fast. Any plans on how you are going to mount the LED into your host? Iāve modded a 348 with one of these where I just soldered the LED to a rectangular copper bar 2x3x6mm and then glued to the pillā¦
Iāve got some more playing to do with these today. Any wishes what one should do to a de-domed or, should I say āde-windowedā UV led? :smiling_imp:
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. Aināt that sweetā¦
This will soon need itās own separate thread
Iāve had some time to prepare a test of the same led at 1700mA and leave it running overnight. The thermal performance looks very promising.
Iāve then had the led running at 2000mA for an hour and it stabilized at 79Ā°C. Thatās 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. Iāve ordered a set of Omega K-type thermocouple to cover temerature in the logged dataā¦