About the smallest optoisolator packages I've run across are SO-8 parts. Anything less than that has very low creep specs (isolation voltage), so I don't think the manufacturers are interested in packaging them any smaller. Matt Pobursky Maximum Performance Systems On Fri, 5 Mar 2004 08:38:42 -0800, al smith wrote: > Well, I finally resolved my issue with the hot swap controller by using a > opto isolator. The big issue was the difference between the board digital > ground that was isolated from the 48V ground, as there was a few volts > difference between them. I used a PS2501 to test this, and it works, but > the package is a little big. So I am looking for a recomendation of a very > small opto, working voltage is only up to 70VDC, no high voltage isolation > is really required, but price of course is a consideration. Maybe I am > stuck with this package, but seems to me Sharp had some small packages, so > I'll look while waiting on a response. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body