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Subject:	Re: Footprint standards for Polarized components (Diodes)
From:	"Kevin L. Seaman" <[log in to unmask]>
Reply To:	[log in to unmask]
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

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