TECHNET Archives

February 2010

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
Sender:
X-To:
TechNet E-Mail Forum <[log in to unmask]>
Date:
Thu, 4 Feb 2010 07:47:24 -0800
Reply-To:
TechNet E-Mail Forum <[log in to unmask]>, pearl petras <[log in to unmask]>
Subject:
From:
pearl petras <[log in to unmask]>
Content-Transfer-Encoding:
quoted-printable
In-Reply-To:
Content-Type:
text/plain; charset="iso-8859-1"
MIME-Version:
1.0
Parts/Attachments:
text/plain (156 lines)
More info

5 mil trace, 0.5oz Cu.  Board is 10 layer, .063"
The material is rated to IPC4101B/129.
Still trying to find out the reflow profile.
The board sees double-sided reflow.  Not sure if the BGA is on 1st or 2nd side.
There may also be a repetitive mechanical stress factor though, based on how the board is installed in the chassis.
Had occasional intermittents before, but now we have a few occurrences over a short period of time.  
A peel strength test apparently passed, but that was done on the board after the 2 reflow cycles.  Would that potentially influence the results if possibly the board material wasn't properly cured?


--- On Wed, 2/3/10, pearl petras <[log in to unmask]> wrote:

> From: pearl petras <[log in to unmask]>
> Subject: Re: [TN] track lifting
> To: [log in to unmask]
> Received: Wednesday, February 3, 2010, 10:26 AM
> I'll see what I can do to reply to
> all the questions.
> 676 ball,  1 mm pitch, 27mm sq
> tracks lifted on only one side of device.
> not all tracks lifted, and sometimes non-adjacent tracks
> lifted, which was a mystery to us, but if John is noticing
> some tracks are broken, that might explain it.  We
> hadn't noticed that yet.
> leadfree
> Has happened a few times.  We are trying to determine
> when in the process, now.  Unsure if during production
> or only after it leaves our facility.
> 
> 
> Thanks for all the replies so far.
> 
> 
> --- On Wed, 2/3/10, Leland Woodall <[log in to unmask]>
> wrote:
> 
> > From: Leland Woodall <[log in to unmask]>
> > Subject: Re: [TN] track lifting
> > To: [log in to unmask]
> > Received: Wednesday, February 3, 2010, 9:57 AM
> > Brian,
> > 
> > Was the strain you mention below originate from the
> reflow
> > process?  Was
> > it because of a thermal mismatch or an accelerated
> cooling
> > rate?
> > 
> > Just curious...
> > 
> > Leland
> > 
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]]
> > On Behalf Of Brian Chandler
> > Sent: Wednesday, February 03, 2010 7:28 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] track lifting
> > 
> > We just conducted a study on acceptable strain levels
> for
> > lead free
> > products. 
> > Our BGA test coupons showed this exact result from
> excess
> > strain.
> > 
> > ---------------------------------------------------
> > Technet Mail List provided as a service by IPC using
> > LISTSERV 15.0
> > To unsubscribe, send a message to [log in to unmask]
> > with following text
> > in
> > the BODY (NOT the subject field): SIGNOFF Technet
> > To temporarily halt or (re-start) delivery of Technet
> send
> > e-mail to
> > [log in to unmask]:
> > SET Technet NOMAIL or (MAIL)
> > To receive ONE mailing per day of all the posts: send
> > e-mail to
> > [log in to unmask]:
> > SET Technet Digest
> > Search the archives of previous posts at:
> > http://listserv.ipc.org/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
> > -----------------------------------------------------
> > 
> > ---------------------------------------------------
> > Technet Mail List provided as a service by IPC using
> > LISTSERV 15.0
> > To unsubscribe, send a message to [log in to unmask]
> > with following text in
> > the BODY (NOT the subject field): SIGNOFF Technet
> > To temporarily halt or (re-start) delivery of Technet
> send
> > e-mail to [log in to unmask]:
> > SET Technet NOMAIL or (MAIL)
> > To receive ONE mailing per day of all the posts: send
> > e-mail to [log in to unmask]:
> > SET Technet Digest
> > Search the archives of previous posts at: http://listserv.ipc.org/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
> > -----------------------------------------------------
> > 
> 
> 
>      
> __________________________________________________________________
> Ask a question on any topic and get answers from real
> people. Go to Yahoo! Answers and share what you know at http://ca.answers.yahoo.com
> 
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using
> LISTSERV 15.0
> To unsubscribe, send a message to [log in to unmask]
> with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send
> e-mail to [log in to unmask]:
> SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send
> e-mail to [log in to unmask]:
> SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/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
> -----------------------------------------------------
> 


      __________________________________________________________________
Yahoo! Canada Toolbar: Search from anywhere on the web, and bookmark your favourite sites. Download it now
http://ca.toolbar.yahoo.com.

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/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