TECHNET Archives

March 1997

TechNet@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
Mime-Version:
1.0
Content-Type:
text/plain; charset=us-ascii
References:
<[log in to unmask]>
Date:
Tue, 25 Mar 1997 07:55:56 -0500
Precedence:
list
Resent-From:
[log in to unmask]
Resent-Sender:
TechNet-request [log in to unmask]
X-Status:
Status:
O
X-Mailing-List:
<[log in to unmask]> archive/latest/11434
From [log in to unmask] Tue Mar 25 11:
36:54 1997
TO:
[log in to unmask]
Return-Path:
<TechNet-request>
X-Loop:
[log in to unmask]
Received:
by ipc.org (Smail3.1.28.1 #2) id m0w9VYi-000BikC; Tue, 25 Mar 97 06:42 CST
Resent-Message-ID:
<"p27Ax3.0.PBC.xWyDp"@ipc>
Subject:
Solder Mask Coverage and exposed SN/PB and Copper
From:
Mike Masters <[log in to unmask]>
Old-Return-Path:
<[log in to unmask]>
In-Reply-To:
[log in to unmask] "Re: FW: Interconnection Resistance, Multilayer Printed Wiring." (Mar 24, 4:29pm)
X-Mailer:
Z-Mail 4.0.1 (4.0.1 Apr 9 1996)
Message-Id:
<970325075407.ZM8751@msaipc>
Parts/Attachments:
text/plain (43 lines) 

I have a question that is two fold.  It concerns Solder Mask coverage on PCBs.  
IPC 610B addresses this issue some what but does leave a lot out.  I am tasked 
to set a standard for Mitsubishi Semiconductor for solder mask coverage on PCBs 
and to determine when the manufacturer fails the criteria.

	1.  Question 1:  What publications are available showing industry 
	standards for solder mask coverage over bare copper as well as over
	SN/PB?  I am aware of IPC 610B.

	2.  Question 2:  Hoe much solder mask coverage is necessary for traces
	that are already SN/PB coated?  I do have a standard for exposed bare
	copper.  I am thinking especially for those traces that are adjacent to
	each other with at best an 8 mil lines and spaces.

Any response would be helpful,  Thanks


-- 
    /\    
   _\/_   
  /_/\_\  

Mike Masters
QA Materials Engineering Section
Office: (919) 479-3771
FAX:    (919) 479-3328
Internet:  [log in to unmask]



***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To subscribe/unsubscribe send a message <to: [log in to unmask]>   *
* with <subject: subscribe/unsubscribe> and no text in the body.          *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact   *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      *
***************************************************************************

ATOM RSS1 RSS2