Declan Moriarty wrote: > > Was it Elbert Smit who wrote on Thursday 31 October 2002 14:23: > > Hello Tinco, Declan & others, > > > > They function as a digital switch, it is used for serial communication at > > 9600 baud. But I don't understand why the specification defines a minimum > > inactive current. As Declan stated, the transistor leaks only nA or pA and > > not uA's. Minimum"On"-current for the diode is not clearly specified, so > > there's where I lose the link to a mininum inactive current... > > Could it be minimum diode current which causes no transistor current?
I would certainly guess the same. Instead of specifying a "minimum on" current, they specify a "maximum off" current - that's the only thing that would make sense in this whole context.... In general I would expect the threshold for light emission from a light emitting diode (almost independent of the color and material) to be in the uA range: for low currents non-radiative recombination processes dominate even in direct band gap semiconductors. Over a wide range the light emission is then directly proportional to the forward current (-> external quantum efficiency), before the light emission saturates (that's just before thermal destruction...). Uwe. -- Author: Uwe Zimmermann INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
