Well IIRC, the "dark current" of a phototransistor can indeed reach uA at elevated temperatures - there is a very severe temperature effect on the leakage current (see the curves in the datasheet).
Joe. > -----Original Message----- > From: Elbert Smit [SMTP:[EMAIL PROTECTED]] > Sent: Friday, November 01, 2002 1:24 AM > To: Multiple recipients of list CHIPDIR-L > Subject: RE: Maximum input current, inactive > > Hello Tinco, Declan & others, > > > I didn't make too much sense of this. Are you trying to use > > > an optocoupler in > > > 'analogue' mode, or pulsing it? If the former, forget it > > > quickly. The only > > > way to use those things is as digital switches > > 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... > > Kind regards, > > Elbert Smit. > -- Author: da Silva, Joe 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).
