DESIGNERCOUNCIL Archives

September 2006

DesignerCouncil@IPC.ORG
Options: Use Monospaced Font
Show Text Part by Default
Condense Mail Headers

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

Print Reply
Sender:
DesignerCouncil <[log in to unmask]>
X-To:
Designers Council Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 6 Sep 2006 08:09:34 -0400
Reply-To:
[log in to unmask]
Content-Transfer-Encoding:
7bit
Subject:
Re: Soldermask - question?
From:
Gary Ferrari <[log in to unmask]>
Content-Type:
text/plain; charset=ISO-8859-1; format=flowed
In-Reply-To:
<[log in to unmask]>
Organization:
Ferrari Technical Services
MIME-Version:
1.0
Parts/Attachments:
text/plain (59 lines) 
Raja,

The database you send to your fabricator should contain 1:1 soldermask
clearances. Your master drawing should contain a note that gives
permission to resize the mask for minimal mask to land clearance. But,
don't forget to include a note to manufacture in accordance with
IPC-6011/12. These IPC performance specifications specify the allowable
variation of the soldermask application. In other words, clearances not
to expose adjacent copper, amount of soldermask allowed on lands, skips,
etc.

Regards,

Gary Ferrari
FTG Circuits
Director, Technical Support
860-350-9300

No Name wrote:
>    Hi All,
>
>  I am recently shifted into PCB design filed; interesting field off course!!! satisfied being a part of product development.
>  Now started learning the reason for each task I perform. Hope I can get more suggestions from expertise here :-).
>
>  I understand the reason that slodermask is used for better solderability, but I want to know why we provide certain clearance like 0.005" or 0.004" more than pad size, sometimes I see soldermask missing (say on BGA). Any problems you have experienced due to larger or smaller soldermasks?
>
>  Is there any specific standards or calculation used for soldermask creation based of padstack,Assembly process say wave soldering or reflow soldering? How IPC calculates this? I have IPC SM782.
>
>  Awaiting for your suggestions.
>
>  Thanks,
>  Raja.
>
>
>     Check out AOL.com today. Breaking news, video search, pictures, email and IM. All on demand. Always Free.
>
> ________________________________________________________________________
> Check out AOL.com today. Breaking news, video search, pictures, email and IM. All on demand. Always Free.
>
> ---------------------------------------------------------------------------------
> 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