UV leds 365nm 4-12mW radiantpower in PLCC2 - needed - Page 1
Forum section: electronics / general

author: Lukapt
author_rank: Newbie
timestamp: March 31, 2013, 12:52:17 pm
content: Hi,I'm looking for leds mentioned in subject.I was looking on ebay, farnell, rs, mouser, d-key. No one stock them.I've found supplier on Alibaba, but they didnt respond for my email.I need only 225-250pcs max.Anyone knows where can I find them?ThanxLuke

author: SeanB
author_rank: Super Contributor
timestamp: March 31, 2013, 02:43:58 pm
content: Might be what you are lokking for, though it is hard as you give no country.https://dfad.com.au/shop.php?action=Shop&cat=7A familiar face on some of Dave's videos if I am not mistaken.

author: PedroDaGr8
author_rank: Super Contributor
timestamp: March 31, 2013, 07:05:54 pm
content: Quote from: Lukapt on March 31, 2013, 12:52:17 pm365nm in PLCC2 at 12mW? Not likely. 365nm puts you well into the range where the absorption of the encapsulation materials is going to become an issue. Many of your silicone-resin and epoxy-resin based materials have large increases in absorbance at around 360-370 unfortunately for you. This doesn't even include the standard UV-cured plasticizers that are often used (which of course absorb very well in the UV range. If you can make do with a higher wavelength you will be much more likely to find what you are looking for. If someone makes a UV-LED in these types it is going to be very dim because a huge percentage of the UV light is going to be absorbed by the encapsulation material. So finding 12mW is going to be very difficult, let alone these are going to be VERY expensive. Plan on bare minimum being around $5/chip at 12mW and I wouldn't be surprised if it was MUCH higher, in the $15-40 range. Just based on my quick looks at what is being sold. AP Technologies, Fox technolgoies, and a few other appear to market PLCC2 365nm but they are 0.3-1mW output. ALso roithner-laser markets some in the 3mW category for a small SMD UV LED (and 20mW for a 5mm by 5mm SMD LED). The fact is, you are in a specialized area.Most of the "UV" leds listed on sites like Alibaba, etc. are not actually true UV. They are just deep purple (so a small amount of UV is emitted but mostly purple). Many materials fluoresce under deep-blue or shorter wavelengths so they behave a bit like blacklights but they are not true UV. Plus, trusting a sales person on Alibaba is not the wisest thing to do, frankly trusting a sales person period is not wise. First thing I would do is if they get back to you ask for a sample so that you can test the emission spectra.

author: Lukapt
author_rank: Newbie
timestamp: April 01, 2013, 11:26:35 am
content: Hi,Thanx for replies.I knew that 12mW is to optymistic, 4-6mW will do.I'm a hobbyist and decided to upgrade my current UV exposure unit (that I made few years ago) for PCB making.Current "model" is made with 100 3mm leds, unknown wavelenght (don't remember) and power.And cause I have few boards designed/manufactured for white leds in PLCC2, I decided to find UV leds in the same package and replace current version.But I found that leds in this range 355-375nm are very very rare.One manufacturer from Alibaba replied, they sell them in min. quantity is 2000 for 0.38$/pc.That is to much leds for my needs.Still looking.p.s.ooo, and I forgot to tell that I won't be able to measure output power (have to trust what it's said on the can)

author: BravoV
author_rank: Super Contributor
timestamp: April 02, 2013, 01:41:08 am
content: I'm assuming your current UV exposure light is using UV FL tube, any reason why you want to switch to led based ?

author: Lukapt
author_rank: Newbie
timestamp: April 02, 2013, 10:37:23 am
content: Quote from: BravoV on April 02, 2013, 01:41:08 amIt' made with leds, I made it so I know:Quote

author: BravoV
author_rank: Super Contributor
timestamp: April 03, 2013, 03:09:04 am
content: Missed that part, sorry.What I meant is whats wrong using a uv fl insect lamp ? Its recommended and proven to work very well, and best part is they're cheap and I believe its available almost everywhere in big cities.I just started to play with photo resist film for pcb, made a thread on the fl tube selection ->Here