My preference is to use functional pin designations something like k1a2 a1 k2
or d s g or c e b SOT23 devices, connectors, and diodes are the most common errors I have made in my 18 years of layout work. A package change because of power, availability, or an alternate manufacture can confound the documentation. I have been notified of problems even when none exist because of pin numbering variations between silicon manufactures. I also find the design engineers appreciate that a schematic symbol selection does not preclude them from getting the layout correct even if the package changes during the design process. We use Orcad Capture for schematic entry and spice modeling. Protel for layout. Dave Eloranta [EMAIL PROTECTED] -----Original Message----- From: Mira [mailto:[EMAIL PROTECTED] Sent: Wednesday, July 14, 2004 9:58 PM To: Protel EDA Forum Subject: Re: [PEDA] SOT-23 pinout Hi Dom, The basic numbering is 3 1 2 However many other variants of the pinout exist out there. Rule 1: Always check the datasheet. Mira --- Dom Bragge <[EMAIL PROTECTED]> wrote: > When you organise your footprints, what pinout do > you use for SOT-23's? > > Do you organise the pins... > -like shown in the attachment? > -or with pins 2&3 reversed? > > The bigger question really is: Where do you derive > your pin numbering > guidance from? > > I find that some datasheets just show the pin names > against the actual > pins (& cutout the middleman of *numbers*) thus > avoiding the issue > altogether. This doesn't help those of us who want > to be able to use a > common footprint across multiple designs. > > One answer is "define your own company standard", > but if I chose > against an industry standard, that'd be a bit silly > wouldn't it. > > ===== > Dom Bragge CID > Snr PCB Designer > Sydney, Australia > ( 99SE sp6 ) > > Find local movie times and trailers on Yahoo! > Movies. > http://au.movies.yahoo.com > > * * * * * * * * * * * * * * * * * * * * * * * * * * > * * * * > * 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/[EMAIL PROTECTED] > * * * * * * * * * * * * * * * * * * * * * * * * * * > * * * * > __________________________________ Do you Yahoo!? Yahoo! Mail Address AutoComplete - You start. We finish. http://promotions.yahoo.com/new_mail * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
