DESIGNERCOUNCIL Archives

March 2007

DesignerCouncil@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
"Kevin L. Seaman" <[log in to unmask]>
Reply To:
Date:
Tue, 20 Mar 2007 07:14:22 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (60 lines)
Gary,

We use CAD tools that allow alphabetic pin "numbers".

So, we use A and C as pin "numbers" for both the schematic symbol
and the PCB footprint of all diodes.

For SOT23 diodes we use AA, AC, CC, and NC as required.

For transistors, we use E, B, C, G, S, and D.

This has eliminated all polarity problems with these parts.

Thank you,

Kevin L. Seaman
OrCAD CIS & Allegro PCB Library Liaison
Sr. Staff PCB Layout Engineer
Broadcom Corp. Irvine, CA
(949) 926-5656

========================= Original Message ==========================

From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Gary Bremer
Sent: Monday, March 19, 2007 6:25 PM
To: [log in to unmask]
Subject: [DC] Footprint standards for Polarized components (Diodes)

Hi,
I have been asked if there is a standard for creation of footprints 
espicially for diodes. One of the designers reversed the cathode and anode 
causing all the diodes to be placed backwards. The rational was the pin 1 
was the anode for this device for other diodes pin 1 is the cathode.

Gary Bremer CID
Manufacturing Engineer

_________________________________________________________________
Exercise your brain! Try Flexicon. 
http://games.msn.com/en/flexicon/default.htm?icid=flexicon_hmemailtaglinemarch07

---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at
[log in to unmask] or 847-615-7100 ext.2815
---------------------------------------------------------------------------------

---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
---------------------------------------------------------------------------------

ATOM RSS1 RSS2