I have to respond!
Last year when we were again brought to a halt by Snow, The Times newspaper
did a survey of Moscow, Stockholm, Oslo etc, all the Cities where they get
snow every year and apparently cope.
What they found was that every where the first few days of snow was always a
surprise and seemingly chaotic, then they cope. So the comparison you are
getting is London in the first few days versus everywhere in their normal
condition. Of course we then revert to our normal which is no snow, but
there's no story in "no snow everything working".
Also the Brit media covers this sort of thing extensively and being in
English, makes cheap copy for your news (with a US voice over), presumably
on the lines of "Bumbling Brits". Similarly we often get more coverage of US
events than the news content really justifies, usually on the lines of "Only
in America".
Graham's golf is something else.
Regards
Mike
ü Please consider the environment before printing this e-mail
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (EHCOE)
Sent: Thursday, December 16, 2010 2:34 PM
To: [log in to unmask]
Subject: Re: [TN] NTC [TN] X-ray inspection of voids under chip caps and
resistors
Look what happens to London when they get major snow; although they
admirably try, everything generally comes to a halt. Except for Graham; with
his golf game he is used to driving in the rough.
Balmy and Sunny (81º F) in Scottsdale
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Thursday, December 16, 2010 7:10 AM
To: [log in to unmask]
Subject: Re: [TN] NTC [TN] X-ray inspection of voids under chip caps and
resistors
Everywhere there is significant regular snowfall, there is some experience
and preparation for driving in it, at least for a large part of the local
population. And even here we all marvel at the complete idiots such as the
person I saw last week who passed me while eating a roll, talking on a
cellphone, and drinking coffee all at the same time while there was only two
small ruts in the ice in each lane to drive in. After passing me, this
person spun out aways ahead of me and crashed into both barriers on each
side of the road, bouncing back and forth like a ping-pong ball. I stopped
to help, and you know what this person said after getting out of the car?
"Why does stuff like this happen to me?"
For Singapore or any other major city not used to snow, to have a major
snowstorm would be catastrophic.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Thursday, December 16, 2010 12:53 AM
To: [log in to unmask]
Subject: Re: [TN] NTC [TN] X-ray inspection of voids under chip caps and
resistors
Without snow tires on your car like in your neck of woods, you don't want
snow. Believe me.
--------------------------
Sent using BlackBerry
----- Original Message -----
From: Ong Seet Leng [mailto:[log in to unmask]]
Sent: Thursday, December 16, 2010 01:40 AM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [TN] NTC [TN] X-ray inspection of voids under chip caps and
resistors
How I wish there is snow in Singapore.
Regards,
Seet Leng
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Thursday, December 16, 2010 2:35 PM
To: [log in to unmask]
Subject: Re: [TN] NTC [TN] X-ray inspection of voids under chip caps and
resistors
It snowed in the mountains this week; you're too late. :-)
http://famagusta-gazette.com/cold-snap-hits-cyprus-as-snow-falls-p11082-69.h
tm
You can see in the photo the bottom end of one of the ski lifts.
Brian
On 15/12/2010 19:31, Stadem, Richard D. wrote:
> LOL! Pretty soon it will snow in Cyprus as well!
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
> Sent: Wednesday, December 15, 2010 11:28 AM
> To: [log in to unmask]
> Subject: Re: [TN] NTC [TN] X-ray inspection of voids under chip caps and
resistors
>
> Is that why the sky opened up to provide with them sufficient sample size
for statistic validation few days ago?
> --------------------------
> Sent using BlackBerry
>
>
> ----- Original Message -----
> From: Werner Engelmaier [mailto:[log in to unmask]]
> Sent: Wednesday, December 15, 2010 10:29 AM
> To: [log in to unmask]<[log in to unmask]>
> Subject: Re: [TN] NTC [TN] X-ray inspection of voids under chip caps and
resistors
>
> Steve,
> What me joking about the EU-anybody who can mindlessly ban Pb from solder,
certainly can regulate banana curvature-I am hearing the size of snowflakes
is next [now that is a joke]
> Werner
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: Steve Gregory<[log in to unmask]>
> To: 'TechNet E-Mail Forum'<[log in to unmask]>; 'Werner
Engelmaier'<[log in to unmask]>
> Sent: Wed, Dec 15, 2010 9:43 am
> Subject: RE: NTC [TN] X-ray inspection of voids under chip caps and
resistors
>
>
> Werner, I thought you were just making a joke about "the EU specifying the
>
> allowable curvature of bananas", but you weren't!
>
>
>
> http://tinyurl.com/y9t8lr3
>
>
>
> Geeze...don't know what to say. Can't believe that there's actually a
>
> quality standard written for bananas
>
>
>
> Steve
>
>
>
> -----Original Message-----
>
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier
>
> Sent: Wednesday, December 15, 2010 8:24 AM
>
> To: [log in to unmask]
>
> Subject: Re: [TN] X-ray inspection of voids under chip caps and resistors
>
>
>
> Hi Phil,
>
> It is an old story---just because you can measure something---even with,
or
>
> maybe because of very expensive equipment, does not make it necessarily
>
> significant or important. It has been shown over and over again, that
voids
>
> in the normally produced ranges have no negative [there is actually a
slight
>
> positive effect under some limited special conditions] reliability impact.
>
> It is like the EU specifying the allowable curvature of bananas.
>
> Werner
>
>
>
>
>
>
>
>
>
>
>
>
>
> -----Original Message-----
>
> From: David D. Hillman<[log in to unmask]>
>
> To: [log in to unmask]
>
> Sent: Wed, Dec 15, 2010 8:11 am
>
> Subject: Re: [TN] X-ray inspection of voids under chip caps and resistors
>
>
>
>
>
> Hi Phil - There are a number of X-ray systems on the market that can
>
>
>
> accomplish the task per the NASA Workmanship standards but the question
>
>
>
> really should be "why is there such a requirement?". Rockwell Collins,
>
>
>
> RIM, Indium and Dage are finishing up a BGA voiding study that shows voids
>
>
>
> are not a "primary" issue to solder joint integrity. We will be proposing
>
>
>
> to the JSTD-001 committee new BGA voiding requirements, in collaboration
>
>
>
> with a number of other industry investigators, at the IPC 2011 Fall
>
>
>
> meeting. I find it a bit hard to believe that a chip resistor needs a
>
>
>
> stricter solder joint void requirement than a BGA component.
>
>
>
>
>
>
>
> Dave Hillman
>
>
>
> Rockwell Collins
>
>
>
> [log in to unmask]
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Phil Bavaro<[log in to unmask]>
>
>
>
> Sent by: TechNet<[log in to unmask]>
>
>
>
> 12/14/2010 06:06 PM
>
>
>
> Please respond to
>
>
>
> TechNet E-Mail Forum<[log in to unmask]>; Please respond to
>
>
>
> [log in to unmask]
>
>
>
>
>
>
>
>
>
>
>
> To
>
>
>
> [log in to unmask]
>
>
>
> cc
>
>
>
>
>
>
>
> Subject
>
>
>
> [TN] Xray inspection of voids under chip caps and resistors
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Are any Technetters working with the newly drafted Workmanship standard
>
>
>
> (WSF 11122010) from NASA?
>
>
>
>
>
>
>
> I am surprised that they are intending to implement xray inspection of
>
>
>
> voiding on chip caps and resistors.
>
>
>
>
>
>
>
> It appears they want us to determine the percentage of voids greater
>
>
>
> than 1 mil and then add up the areas both for the beneath component and
>
>
>
> then the external fillets.
>
>
>
>
>
>
>
> While I suppose it is progress to have NASA embracing water soluble
>
>
>
> fluxes, this seems like a huge hurdle to have to cross first.
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Here is the requirement as drafted:
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> 1. The X-ray process (including equipment, operator and procedure)
>
>
>
> shall be capable of discerning a solder void that is one thousandth of
>
>
>
> an inch (0.001") in diameter. If the supplier's X-ray capability is not
>
>
>
> adequate, specimens can be sent to GSFC for X-ray.
>
>
>
>
>
>
>
> 2. For each PWA or coupon examined via X-ray, five worst case
>
>
>
> examples on the PWA or coupon shall be selected for measurement to show
>
>
>
> compliance with the following criteria:
>
>
>
>
>
>
>
> a. For parts with chip package styles (e.g. resistors, diodes,
>
>
>
> capacitors) and for flatpacks, a minimum of 75% of the solderable area
>
>
>
> directly under the end cap or lap portion of the lead shall be
>
>
>
> filled/wetted (i.e., using the solderable area under the end cap or lead
>
>
>
> as the denominator and that area less all absences of solder - voids,
>
>
>
> areas where the solder did not wet, overhangs due to misregistration,
>
>
>
> etc. - as the numerator). This requirement applies only to the area
>
>
>
> directly underneath the end cap (chip packages) and lap portion of the
>
>
>
> lead (flatpacks), and does not apply to other package styles and does
>
>
>
> not include any portion of the fillet.
>
>
>
>
>
>
>
> b. For all package styles, the void area in the fillet area shall
>
>
>
> include only those areas that are completely enclosed with solder, and
>
>
>
> shall not exceed 10% of the area covered by the fillet.
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> I know that some xray systems have pretty helpful software packages for
>
>
>
> void detection, but I don't remember any that looked at solder
>
>
>
> percentages beneath the component versus fillet versus both.
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
----------------------------------------------------------------------------
>
> --
>
>
>
> This message and any attachments are solely for the use of the addressee
>
>
>
> and may contain L-3 proprietary information that may also be defined as
>
>
>
> USG export controlled technical data. If you are not the intended
>
>
>
> recipient, any disclosure, use or distribution of its content is
>
>
>
> prohibited. Please notify the sender by reply e-mail and immediately
>
>
>
> delete this message and any attachments.
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> ______________________________________________________________________
>
>
>
> 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.aspx?Pageid=E-mail-Forums 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.aspx?Pageid=E-mail-Forums
>
>
>
> 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.aspx?Pageid=E-mail-Forums 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.aspx?Pageid=E-mail-Forums for additional
information, or contact Keach Sasamori at [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]
> ______________________________________________________________________
>
> ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
______________________________________________________________________
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.aspx?Pageid=E-mail-Forums 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]
______________________________________________________________________
---------------------------------------------------------------------
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]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
______________________________________________________________________
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.aspx?Pageid=E-mail-Forums for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
***This email, its content, and any files transmitted with it, are intended solely for the addressee(s) and may be legally privileged and/or confidential. If you are not the intended recipient, please contact the sender by return and delete the material from any computer. Any review, retransmission, dissemination, or other use of, or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited.
Messages sent via this medium may be subjected to delays, non-delivery, and unauthorized alteration. This email has been prepared using information believed by the author to be reliable and accurate, but Indium Corporation makes no warranty as to accuracy or completeness. Indium Corporation does not accept responsibility for changes made to this email after it was sent. Any opinions or recommendations expressed herein are solely those of the author. They may be subject to change without notice.***
______________________________________________________________________
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.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
