 
| Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0wgabA-000BjQC; Tue, 24 Jun 97 13:45 CDT |
| Content-Type: |
text/plain; charset=us-ascii |
| CC: |
|
| References: |
|
| Date: |
Tue, 24 Jun 1997 11:58:08 -0700 |
| From [log in to unmask] Tue Jun 24 16: |
36:41 1997 |
| Resent-From: |
|
| Resent-Sender: |
|
| MIME-Version: |
1.0 |
| Status: |
O |
| X-Mailing-List: |
|
| TO: |
|
| Return-Path: |
<TechNet-request> |
| X-Status: |
|
| Precedence: |
list |
| X-Loop: |
|
| Resent-Message-ID: |
<"ImnvJ2.0.BGD.VN1ip"@ipc> |
| >From willli Tue Jun 24 13: |
46:28 1997 |
| Subject: |
|
| From: |
|
| Content-Transfer-Encoding: |
7bit |
| Old-Return-Path: |
|
| X-Mailer: |
Mozilla 3.01Gold (Win95; I) |
| Message-ID: |
|
| Parts/Attachments: |
|
|
Bruce Boyes wrote:
> Tin plate is dipped in a plating tank. Soldercoat is dipping in molten
> solder. Solder is usually a much thicker layer and harder to control, so
> expect some blobs due to surface tension of the solder, I guess. Solder is
> also a tin/lead alloy whereas tin plate is presumably, well, tin.
I can certainly understand that, but I am wondering why we have never
tin plated digital SMT boards at the last three or four companies I have
worked with. One less thermal shock to the board and flatter lands, so
what is the down side? Why not ALWAYS use it over soldercoat? What am I
missing?
> Supposedly, you can start to see the effect even at 33 MHz or more on fast
> digital lines with sharp vs rounded corners.
Thank you for responding, but I was really looking for data on round
versus chamfered.
onward thru the fog.... Jack
***************************************************************************
* 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] *
***************************************************************************
|
|
|
