If you Google "Led Degredation", you'll get about 10,000 hits. But the PDF below pretty well nails it in general terms: http://www.litebeams.com/pdf/caltrans.pdf . --Bob Joe Mailer wrote: > Interesting matter, do you know any paper that tells about this issue ? I= 'm not quote sure about iCouplers degrade. > > Bob Axtell escribi=F3: Joe Mailer wrote: > = >> Hello, >> >> I have two systems A and B. I'd like to have a robust optically isolated= communication line (going real time). I have choose RS-232/422/485 as poss= ible communication protocols. = >> >> I have been searching the net for optoisolators, there are a huge amount= of those, but thinking that communication is bidirectional and it could be= fast, what are more suitable optoisolators for doing such a thing ? I have= been looking to (new) analog iCouplers[1], those look good, but i need goo= d MTBF and good support in the future. = >> >> Any other good idea ? >> >> Thanks ! >> >> [1] http://www.analog.com/UploadedFiles/Product_Highlights/6199138056279= 63397963229iCoupler_Brochure.pdf >> >> = >> --------------------------------- >> >> LLama Gratis a cualquier PC del Mundo. >> Llamadas a fijos y m=F3viles desde 1 c=E9ntimo por minuto. >> http://es.voice.yahoo.com >> = >> = > You have to be a little bit careful with opto-isolators. They degrade = > with time, degrade even faster if > the IR led is driven hard, so the performance you see initially won't = > hold up later. > > --Bob > = -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist