TECHNET Archives

October 2009

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

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

Print Reply
Subject:
From:
"Kane, Amol (349)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kane, Amol (349)
Date:
Mon, 19 Oct 2009 13:05:02 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (256 lines)
so i am assuming no words of wisdom on this other than from ??

________________________________________
From: TechNet [[log in to unmask]] On Behalf Of Dwight Mattix [[log in to unmask]]
Sent: Saturday, October 17, 2009 7:50 PM
To: [log in to unmask]
Subject: Re: [TN] No Soldermask between Fine pitch QFN and QFP

At 02:52 PM 10/17/2009, Kenneth Wood wrote:
>Then again...I guess one of ours kinda went KaBoom too LOL

more like (fissszzz)


>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Fjelstad
>Sent: Saturday, October 17, 2009 3:36 PM
>To: [log in to unmask]
>Subject: Re: [TN] No Soldermask between Fine pitch QFN and QFP
>
>Trust me when I say that the technology would have worked just as well in
>the metric system ;-) and the calculations and conversions would have  been
>much easier. (It was, in fact, a Soviet rocket designed using the  metric
>system that put the first man made device on the moon.)
>
>Who knows NASA might have even got there sooner if everything was  designed
>in metric and Shepard might have been able to complete an 18 crater  round
>instead of just hitting a couple of golf balls.  ;-)
>
>Joe
>
>
>
>
>In a message dated 10/17/2009 6:24:21 A.M. Pacific Daylight Time,
>[log in to unmask] writes:
>
>The USA  played golf on the Moon 40 years ago using that old arcane and
>archaic  system...Metric system countries that have played golf on the Moon?
>Oh  yeah...none
>:)
>
>-----Original Message-----
>From: TechNet  [mailto:[log in to unmask]] On Behalf Of Joe Fjelstad
>Sent: Friday, October  16, 2009 4:41 PM
>To: [log in to unmask]
>Subject: Re: [TN] No Soldermask  between Fine pitch QFN and QFP
>
>Hello Amol
>
>Since all electronic  components are now designed, registered and
>fabricated
>using the metric  system, would not it be easier to ask for a 0.5mm pitch
>device with  lands of 0.25mm by 0.7mm?
>
>This is one of the windmills I continue to  joust and I am  constantly
>curious why we in the US continue to be so  wedded to such an  arcane and
>archaic
>measurement system as that  which we  inherited/adopted from our English
>forefathers.
>
>Consider the following from the web:
>
>The metric system  originated in France in the 1790's, a few years after
>Jefferson's  proposals. (note: Jefferson proposed to metric English  system
>for
>the US in the 1780 time frame where there were to 10 inches to  the  foot,
>10 feet to a decade, 100 feet to a rood, 1000 feet to the  furlong  and
>10,000
>feet to the mile) During the mid-nineteenth  century, as expanding  trade
>demanded a consistent set of  measurements, use of the metric system spread
>
>through continental  Europe. As they imported goods from Europe or exported
>goods  to  Europe, Americans became increasingly aware of the metric system.
>In
>1866,  Congress legalized its use in an act reading:
>It shall be  lawful throughout the United States of America to employ the
>weights  and measures of the metric system; and no contract or dealing, or
>
>pleading in any court, shall be deemed invalid or liable to  objection
>because
>the weights or measures expressed or referred  to therein are weights or
>measures of the metric system.
>As a  result, the U. S. has been "metric" since 1866, but only in the sense
>
>that Americans have been free since that time to use the metric system as
>much  as they like. Although there has always been popular resistance  to
>changing the  traditional measures, the metric system has actually  enjoyed
>strong support from  American business leaders and scientists  since the
>late
>
>nineteenth century. In  1875, the U.S. was one of  the original signers of
>the
>Treaty of the Meter."
>and I might  add that we continue to move towards complete metrication of
>our   national measurement systems "inch by inch"... ;-)
>Joe
>
>
>In  a message dated 10/16/2009 10:55:25 A.M. Pacific Daylight Time,
>[log in to unmask] writes:
>
>I am  looking at a 19.7 mil  pitch QFN device with a center pad and
>peripheral pads  at 9.8x27.5  mils, and a 176 pin fine pitch QFP with
>11.8x63
>mil
>pads with  HASL  finish and without any soldermask in between the
>peripheral
>pads!...has  anybody seen this type of a board design before? Any  stencil
>design  suggestions?
>
>I have a couple of pictures I  have requested Steve to post  for me
>regarding the parts ( I am  awaiting Steve's   reply)
>
>
>Thanks,
>Amol
>
>
>
>
>
>WARNING:   Export  Control
>This document may contain technical data within the  definition of  the
>International Traffic in Arms Regulations (ITAR),  and subject to the
>Export
>Control Laws of the U.S.  Government.  Transfer of such data by  any means
>to a
>foreign person, whether in the United States or abroad,  without  proper
>export
>authorization or other approval from the U.S.   Department of State is
>prohibited.
>
>CONFIDENTIALITY NOTICE:
>This e-mail, and any attachments, is for the sole use of the  intended
>recipient(s) and may contain information that is  confidential and
>protected from disclosure under the law. Any  unauthorized review, use,
>disclosure, or distribution is prohibited.  If you are not the intended
>recipient, please contact the sender by  reply e-mail, and delete/destroy
>all copies of the original message  and attachments.
>Thank   you.
>
>---------------------------------------------------
>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
>-----------------------------------------------------
>
>---------------------------------------------------
>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
>-----------------------------------------------------
>
>---------------------------------------------------
>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
-----------------------------------------------------


WARNING:  Export Control 
This document may contain technical data within the definition of the 
International Traffic in Arms Regulations (ITAR), and subject to the Export 
Control Laws of the U.S. Government.  Transfer of such data by any means to a 
foreign person, whether in the United States or abroad, without proper export 
authorization or other approval from the U.S. Department of State is 
prohibited. 
 
CONFIDENTIALITY NOTICE: 
This e-mail, and any attachments, is for the sole use of the intended 
recipient(s) and may contain information that is confidential and 
protected from disclosure under the law. Any unauthorized review, use, 
disclosure, or distribution is prohibited. If you are not the intended 
recipient, please contact the sender by reply e-mail, and delete/destroy 
all copies of the original message and attachments. 
Thank you.

---------------------------------------------------
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