I agree with the square cathode pin 100% we have been doing it this way for a LONG time. Had an interesting problem occur with a SMT diode. Since the pads are both square and to make an outline of the part showing the cathode bar was unfeasible due to limited space we used a K to mark the cathode side, Guess what? The assembly house that was building the board thought the K was diode symbol. Well it made some sense why they stuffed it wrong, a K next to the cathode side meant that pin was the anode to them. Now we mark cathodes on SMT diodes with a bar or a dot. Anyone got a better way of doing it? Cyrus Ringle Sr. CAD Specialist at Inter-Tel ---- http://www.inter-tel.com 7300 West Boston Street Chandler, AZ 85226 Email [log in to unmask] Voice (602) 961-9000 x21216 or Direct 961-2263 Fax (602)961-1370 Vice President of the Greater Phoenix Designers Council ---- A part of the IPC http://www.ipc.org/html/framesetdestypes.html PO Box 3805 Scottsdale, AZ 85271 "Wolfe, Robert" <[log in to unmask]> on 12/30/98 08:15:52 AM Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to "Wolfe, Robert" <[log in to unmask]> To: [log in to unmask] cc: (bcc: Cyrus Ringle/Inter-Tel) Subject: Re: [TN] Assy: LED Failures, I found out what happened... I would second the motion for Jeff's input. We have pretty much done the same thing. Made one shape standard and one symbol standard for all diode's,led's & transistor's. Pin 1 is always the cathode. , no matter what the spec sheet etc. calls out. Now we have had some weird looks and questions from some engineers at times, but when you show them and say does it match the schematic and do the functions of each pin match usually they see the light. Also TO-92 transistors is also a similar problem where different mfg.'s call d, s & g or e, c & b different pin numbers, physically/electrically they are equivalent but between vendors the pin numbers are different (why they do this still amazes me). We did the same here made one shape and made sure all our symbols using this shape reflect those pin numbers. Now from time to time an engineer will blame the cad library because the spec sheet that the engineer happen to look at when they can't get a circuit to work does not match the board markings, (and that is not to say the librarian never makes a mistake) but in this case by keeping it standard this way we have not missed yet on any of these type of parts. The circuit needed tweaking not the library. From the librarian's viewpoint I think by standardizing diode,led,transistor, etc. pin #1's makes for more consistency and less error entering parts. Also once the rest of the departments using this data become familiar with the standard I believe they will embrace it too. Robert M. Wolfe [log in to unmask] ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################