 
| Mime-Version: |
1.0 |
| Sender: |
|
| Old-Return-Path: |
|
| Date: |
Mon, 23 Jun 1997 19:30:02 -0400 |
| From [log in to unmask] Tue Jun 24 16: |
35:25 1997 |
| Resent-From: |
|
| Resent-Sender: |
|
| Content-Transfer-Encoding: |
7bit |
| Status: |
O |
| >From willli Mon Jun 23 18: |
19:58 1997 |
| X-Status: |
|
| Precedence: |
list |
| TO: |
John McGee <ucbvax.Berkeley.EDU!pbni.attmail.com!PBN!PBN1!JMcGee> |
| X-Loop: |
|
| Return-Path: |
<TechNet-request> |
| X-Mailing-List: |
|
| Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0wgIOd-000BjTC; Mon, 23 Jun 97 18:19 CDT |
| Content-Type: |
text/plain; charset=us-ascii |
| References: |
<MS-MAILG-2.00-Note-pbni-JMcGee-0867084050> |
| Resent-Message-ID: |
<"pGJO-3.0.HeD.FImhp"@ipc> |
| Subject: |
|
| From: |
|
| Cc: |
|
| X-Mailer: |
Mozilla 3.0 (X11; I; SunOS 4.1.2 sun4c) |
| Organization: |
Applied CAD Knowledge Inc |
| Message-Id: |
|
| Parts/Attachments: |
|
|
John McGee wrote:
>
> Hello Technetters-
>
> I'm totally unfamiliar with BGA technology. Is there a specification for
> ball
> coplanarity? How is it specified and what would be typical numbers for
> contacts
> of about 1mm diameter over a seating plane with an area of about 325 sq. mm,
> about 18 x 18mm (if that's pertinent)?
If I understood a comment at today's IPC/SMTA BGA Symposium,
there is a specification of +/-.1mm, or a range of ~8 mils.
I think this was quoted from Jedec 95, which I can't put my
hands on right now to confirm.
--
Jeff Seeger Applied CAD Knowledge Inc
Chief Technical Officer Tyngsboro, MA 01879
jseeger "at" appliedcad "dot" com 508 649 9800
***************************************************************************
* 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] *
***************************************************************************
|
|
|
