DESIGNERCOUNCIL Archives

January 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:
Re: naming conventions?
From:
Gary Crowell <[log in to unmask]>
Reply To:
(Designers Council Forum)
Date:
Wed, 31 Jan 2007 15:30:33 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (123 lines) 
Also heard it called a "Down Paddle" of all things.  I'd avoid "Ground
Pad" because it's not *always* ground (learned the hard way).  We use
"Exposed Pad" but would consider anything else if there's a consensus.

Gary Crowell Sr., PE; CID+
Micron Technology

> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On 
> Behalf Of Kevin L. Seaman
> Sent: Wednesday, January 31, 2007 1:09 PM
> To: [log in to unmask]
> Subject: Re: [DC] naming conventions?
> 
> Bill,
> 
> We've seen vendor datasheets refer to this as "Exposed Pad",
> "Ground Pad", "Heat Sink", etc.
> 
> Our first preference is to match the PDF, but when second source
> parts have a different pad name, this is not an option.
> 
> So, we settled in on a generic term of "Heat Sink" (because that's
> what it really is) and we use a pin ~number~ of "HS".
> 
> Thank you,
> 
> Kevin L. Seaman
> OrCAD CIS & Allegro PCB Library Liaison
> Sr. Staff PCB Layout Engineer
> Broadcom Corp. Irvine, CA
> (949) 926-5656 (ext. 65656)
> 
> ========================= Original Message ==========================
> 
> From: DesignerCouncil [mailto:[log in to unmask]] On 
> Behalf Of Brooks,Bill
> Sent: Wednesday, January 31, 2007 12:00 PM
> To: [log in to unmask]
> Subject: [DC] naming conventions?
> 
> Leslie Gomez and I were discussing standards and Cad library 
> symbols and
> footprints and this subject came up... 
> 
> The question has been asked... is there a 'standard' naming 
> convention for
> the large thermal pads used on the underside of chips like 
> the QFN package? 
> Some have called it a 'belly pad' others have called it a 
> 'paddle pin'...
> some call it a 'die pad'. 
> What do you call it and has anyone coined a 'standard name' for it? 
> (Inquiring minds want to know...) :-)
> 
> Reference:  
> http://www.freescale.com/files/analog/doc/app_note/AN1902.pdf
> <http://www.freescale.com/files/analog/doc/app_note/AN1902.pdf> 
> 
> 
> Best regards, 
> 
> 
> Bill Brooks - KG6VVP
> PCB Design Engineer, C.I.D.+, C.I.I.
> DATRON World Communications, Inc.
> 3030 Enterprise Court, Vista, CA 92083
> http://www.dtwc.com
> Tel: (760)597-1500 Fax: (760)597-1510
> e-mail:[log in to unmask]
> IPC Designers Council, San Diego Chapter 
> http://dcchapters.ipc.org/SanDiego/
> Personal Website:
> http://pcbwizards.com 
> 
> 
> 
> --------------------------------------------------------------
> -------------------
> 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
> --------------------------------------------------------------
> -------------------
> 

---------------------------------------------------------------------------------
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