 
| X400-Content-Type: |
P2-1988 ( 22 ) |
| Old-Return-Path: |
|
| Date: |
12 Dec 96 16:27:29 -0500 |
| Precedence: |
list |
| Resent-From: |
|
| Conversion: |
Allowed |
| Disclose-Recipients: |
Prohibited |
| Resent-Sender: |
|
| X-Status: |
|
| Status: |
O |
| From [log in to unmask] Fri Dec 13 12: |
51:08 1996 |
| X-Loop: |
|
| Content-Return: |
Allowed |
| X-Mailing-List: |
|
| TO: |
|
| Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0vYL9U-0000UuC; Thu, 12 Dec 96 18:06 CST |
| Return-Path: |
<TechNet-request> |
| X400-Originator: |
|
| X400-Recipients: |
non-disclosure; |
| Alternate-Recipient: |
Allowed |
| Message-Id: |
<049EF32B078C1004*/c=us/admd=cwmail/prmd=carrier/o=syracuse/ou=ccmail1/s=Parr/g=Aric/@MHS> |
| Resent-Message-ID: |
<"wzJwt3.0.8AA.Vu9io"@ipc> |
| Subject: |
|
| From: |
|
| Priority: |
non-urgent |
| X400-Received: |
by /c=us/admd=cwmail/; Relayed; 12 Dec 96 16:27:29 -0500
by mta MTAwltk in /c=us/admd=cwmail/; Relayed;
12 Dec 96 16:27:29 -0500 |
| Content-Identifier: |
049EF32B078C1004 |
| X400-Mts-Identifier: |
[/c=us/admd=cwmail/; 049EF32B078C1004-MTAwltk] |
| Parts/Attachments: |
|
|
no, your not.
______________________________ Reply Separator _________________________________
Subject: Re: (ASSEM) Wave soldering SOT-23
Author: [log in to unmask] at internet
Date: 12/12/96 3:21 PM
> Tom:
>
> If you are using no-clean flux to solder SOTs (or anything with tall,
> non-solderable body that will repel the wave from reaching the pad,
such as
> tantalum capacitors), dual wave would not work. This is because the
first
> wave (chip or turbulant wave) will kill the flux, resulting in the
poor
> solderability at the second wave (lambda wave). The way we do it
rather
> successfully is to elongate the pad size and solder them with a
vibrating
> wave (omega wave), which has much lower surface energy to reach any
shadowed
> pads. Good luck.
>
> Regards
> Jauwhei Hong
> [log in to unmask]
Jauwhei Hong,
We don't have any problems soldering SOT's with no-clean flux and
dual-wave (chip & lambda). We get fine results if we only use an angle
of 4 degrees, accurate dwell time for the specific pcb and a "perfect"
preheat profile. We also don't have to elongate the pad sizes, we use
the ordinary sizes the pick & place do.
i don't know, but are we different?
/Jan Merstrand
Operation Engineer
Ericsson Microwave Systems
[log in to unmask]
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to: *
* [log in to unmask] with <subject: unsubscribe> and no text. *
***************************************************************************
* 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] *
***************************************************************************
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to: *
* [log in to unmask] with <subject: unsubscribe> and no text. *
***************************************************************************
* 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] *
***************************************************************************
|
|
|
