Electronics Forum: led (Page 1 of 89)

led

Electronics Forum | Thu Jan 06 09:01:53 EST 2005 | Indy

go to the web site of "Lamina Ceramics". They have proprietary packaging technology for LED packaging. Indy

led

Electronics Forum | Thu Jan 06 06:09:43 EST 2005 | calibration

does anyone know of a LED test solution for multiple LEDs' on a PCB that can be used in an incircuit or a functional fixture

led

Electronics Forum | Thu Jan 06 10:56:32 EST 2005 | Rob

If the Leds are not in close proximity then LDR's can be used connected to a node on the ICT/wired into a micro for a simpler board - you can then test for luminous intensity as well as absence. Else you could use a cheap CCD camera with some simple

smd led storage

Electronics Forum | Thu Mar 18 11:07:45 EDT 2010 | mun4o

hi, lately I have problem with smd leds.After reflow 2-4% of leds are broken.I think , that reason is bad storage of components, because in our stock the tape with leds have not Moisture Barrier Bags.My question is ,how you storage components, which

smd led storage

Electronics Forum | Thu Mar 18 14:33:46 EDT 2010 | jdumont

Is your peak reflow temp exceeding the LED spec? We store our SMT LED reels on the rack with the rest of the discreets and have never seen this issue...

smd led storage

Electronics Forum | Mon Mar 22 10:24:14 EDT 2010 | mun4o

Hi , I think that our problem is humidity, because when I use leds from new tape ( pack in MBB ) no any defects.After that, we put opened tape in our store.After 2-3 weeks I use the same tape with leds, and we have 2-3% defective leds.I make this tes

smd led storage

Electronics Forum | Fri Mar 19 07:18:14 EDT 2010 | grahamcooper22

Hi, do you know if your LEDs are moisture sensitive ? And if so what MSL level ? Surprisingly it seems that not all are, but some seem really sensitive. I imagine the differences are down to the plastics used and the LED manufacturing processes. I a

smd led storage

Electronics Forum | Fri Mar 19 03:13:35 EDT 2010 | mun4o

Hi, First check what the Moisture Sensitivity > Level of the LEDS is....you may need to ask the > LED manufacturer. Once you've established it is > moisture sensitive then follow latest version of > IPC JEDEC 33 spec. for storage of them and dryi

smd led storage

Electronics Forum | Fri Mar 19 09:22:32 EDT 2010 | mun4o

Hi, most of them are MSL 3.There are MSL 4 and 2a.Most of defective LEDs are 3528 footprint.The thermoprofile is Ok??

smd led storage

Electronics Forum | Tue Mar 23 03:42:51 EDT 2010 | grahamcooper22

Hi, It is very important to follow IPC JEDEC 33 specification for storage and handing of all MSDs. In many instances defects caused by excess moisture in packages is not immediately evident (pcbs may pass final test) but when pcb has been in the fiel

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