Good for you, Inge!
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: Tuesday, February 16, 2010 9:49 AM
To: [log in to unmask]
Subject: Re: [TN] Pre-Tinned BGA?
Thank you, Werner,
The mis shaped balls are not specifically close to the corners. IF they
were, why only one single among dozens?
Seem to be stretched rather than collapsed. So, there is no std telling
about the ball's shape?
Will not come to FaR, but possibly my successor, a woman you'd like...or
like...
I've in principle already left, but can't stop so abruptly, need go with
reduced speed for a while before taking the step to the 'freedom'.
In opposition to many, I've never been longing for that life, and I will
probably not be the typical freed sort. If I'm blessed with good
health, I'll be busy from 7 to 7 with all kind of activities. Will not
drop TN either, not for a loong time...
Inge
________________________________
From: Werner Engelmaier [mailto:[log in to unmask]]
Sent: tisdag 16 februari 2010 15:21
To: [log in to unmask]; Hernefjord Ingemar
Subject: Re: [TN] Pre-Tinned BGA?
Hi Inge,
You did not give us the location of these 'deformed' balls. If they are
at the BGA corners or under the corner of the die they may have an
impact.
Are they more collapsed or more stretched?
In terms of reliability, solder joint height is the critical geometric
parameter. Any stress concentration geometry, and all these balls have
them to some degree, is about a factor of 2 influence.
Will you come to the IPC Reliability Conference in Frankfurt in May?
Maybe we can talk about it there.
Werner
-----Original Message-----
From: Hernefjord Ingemar <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, Feb 16, 2010 6:17 am
Subject: Re: [TN] Pre-Tinned BGA?
Hi all,
We buy ordinary Tin/Lead-balled BGAs from XILINX. Now, in the Xray
inspection
after soldering, we can often see, that some out of 600 balls are not as
sround
as aspected to be. Instead, some balls are deformed. Not much, but
enough to
start questions whether such balls are accepted or not. Have not seen
anything
about roundness requirements in any norm. A deformed ball can tell you
about
possible electrical issues or about lowering the mechanical fatigue
life. On the
other hand, irregular ball shape may mean nothing. If the electrical
connection
is free from failure, one may neglect the unshape.
The boards are VP soldered. Have any idea if VP is part of our problem?
A typical example is a multilayer board, size about 8x10 inches,
populated with
five BGA560s. The total of 'deformed' balls numbers some ten pcs. We
have had
discussions for weeks without coming to a decision if such balls are
okay or
not. There are no indications of electrical issues (yet.
What is your opinion?
/Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]<mailto:[log in to unmask]>] On
Behalf Of Werner Engelmaier
Sent: tisdag 16 februari 2010 01:51
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [TN] Pre-Tinned BGA?
Thanks Bob,
Didn't know about 2 great suppliers left.
Werner
-----Original Message-----
From: Bob Landman
<[log in to unmask]<mailto:[log in to unmask]>>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Mon, Feb 15, 2010 7:37 pm
Subject: Re: [TN] Pre-Tinned BGA?
Hi Werner,
Well, Lattice Semiconductor (bless them!) still offers Pb/Sn balls on
BGAs and
PLDs and so does Analog Devices (bless them too!).
Others may be more problematic hence we prefer Lattice products for
their
features and their support. They are ideal for small companies like
ours. Their
design tools are very affordable compared to others. Every year their
tools get
better.
Bob Landman
H&L Instruments, LLC
-----Original Message-----
From: TechNet [mailto:[log in to unmask]<mailto:[log in to unmask]>] On
Behalf Of Werner Engelmaier
Sent: Monday, February 15, 2010 7:18 PM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [TN] Pre-Tinned BGA?
Hi Joyce,
where have u been--sure (3) is ideal, but where do you get the
components from?
Werner
-----Original Message-----
From: Joyce Koo <[log in to unmask]<mailto:[log in to unmask]>>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Mon, Feb 15, 2010 6:30 pm
Subject: Re: [TN] Pre-Tinned BGA?
(3) And (1). But not the other. (3) required nothing to be done on the
assembly
level. All the rel data are valid. (1) may need reduced rel qual. The
others,
as material change, most of the mil or hi rel house need full qual
(shake, drop
all the nine yard). It would cost around 30 to 50k plus risk budget
(depend
upon how complicated is your assembly) and 3 month delay. At least it
use to
be. My ancient 1.8 cents.
--------------------------
Sent using BlackBerry
----- Original Message -----
From: TechNet <[log in to unmask]<mailto:[log in to unmask]>>
To: [log in to unmask]<mailto:[log in to unmask]>
<[log in to unmask]<mailto:[log in to unmask]>>
Sent: Mon Feb 15 17:49:57 2010
Subject: [TN] Pre-Tinned BGA?
Hello All,
I had a question to see if anyone has tried anything different. Most of
our
customers are some how related to the military. So we have one product
that the
customer just found out was a PB-Free device. They want us to "pre-tin"
the
spheres. Now I have tried several process for forward and backward
processes.
None of them include re-tinning of a BGA Device. We do re-tin other
leaded and
some non leaded devices. So below are the three options I have
recommended but
still have reliability concerns as the end product is to be coated with
Paralyne.
1. Re- Ball to PB/SN
2. Sue a selective rework machine and place pate with isolated heat if
the
substraight could handle.
3. Purchase the component in PB/SN material 4. Reflow the product with
slightly
higher temps (5c per 10 zones) once out of over and cold to room temp
underfil
the device.
Again if anyone has any more ideas I am game!!
Carl Ray
Lewisburg TN 37091
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask]<mailto:[log in to unmask]>
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 To
unsubscribe, send a message to [log in to unmask]<mailto:[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]<mailto:[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]<mailto:[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]<mailto:[log in to unmask]> or
847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential
information, privileged material (including material protected by the
solicitor-client or other applicable privileges), or constitute
non-public
information. Any use of this information by anyone other than the
intended
recipient is prohibited. If you have received this transmission in
error, please
immediately reply to the sender and delete this information from your
system.
Use, dissemination, distribution, or reproduction of this transmission
by
unintended recipients is not authorized and may be unlawful.
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask]<mailto:[log in to unmask]>
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 To
unsubscribe, send a message to [log in to unmask]<mailto:[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]<mailto:[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]<mailto:[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]<mailto:[log in to unmask]> or
847-615-7100 ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask]<mailto:[log in to unmask]>
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 To
unsubscribe, send a message to [log in to unmask]<mailto:[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]<mailto:[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]<mailto:[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]<mailto:[log in to unmask]> or
847-615-7100 ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask]<mailto:[log in to unmask]>
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 To
unsubscribe, send a message to [log in to unmask]<mailto:[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]<mailto:[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]<mailto:[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]<mailto:[log in to unmask]> or
847-615-7100 ext.2815
-----------------------------------------------------
=
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask]<mailto:[log in to unmask]>
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 To
unsubscribe, send a message to [log in to unmask]<mailto:[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]<mailto:[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]<mailto:[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]<mailto:[log in to unmask]> or
847-615-7100 ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask]<mailto:[log in to unmask]>
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to
[log in to unmask]<mailto:[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]<mailto:[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]<mailto:[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]<mailto:[log in to unmask]> or
847-615-7100 ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask]
______________________________________________________________________
---------------------------------------------------
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
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
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
-----------------------------------------------------
|
