i like the idea of the 3 legged SOT-23 LED to insure polarity in thru hole leds the short leg is ALWAYS the cathode ... well almost always, except for the few that are opposite (there really are some that way!) sometimes assemblers look into the body to see the orientation if the leads are already clipped and there is no obvious flat spot
there is a leg inside with a bigger feature, but believe it or not that cannot be relied upon either Dennis Saputelli "Watnoski, Michael" wrote: > > Greetings, > > I think part of the reason that LEDs are often mounted backwards is > that some types, especially bright red, are mounted reversed in the package. > This appears to be due to the fact that they emit light from the opposite > electrode on the die and the manufacturers are using the same packages as > the earlier devices. Package orientation was once a defacto standard, but > is currently more arbitrary. Read the data sheets carefully make separate > components for the various types and colors. > > Michael Watnoski > > -----Original Message----- > From: Andy Gulliver [mailto:[EMAIL PROTECTED]] > Subject: Re: [PEDA] Seeking Popular or Standard Footprint for Surface > Mount LEDs > > My anti-Murphy tactic is to use SOT-23 LEDs. They may not be a small or > cheap as rectangular footprint parts, but they're a lot harder to fit > wrongly! > > Regards > > Andy Gulliver > -- ___________________________________________________________________________ www.integratedcontrolsinc.com Integrated Controls, Inc. tel: 415-647-0480 2851 21st Street fax: 415-647-3003 San Francisco, CA 94110 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
