The surface finish on PCBs is also a factor in the temp. profile.
ENIG require more thermal energy comparing to other finishes such as HASL
or OSP.
On Wed, Dec 14, 2011 at 6:12 PM, Leif Laerum <[log in to unmask]> wrote:
> Chris,
>
> I think you attached the profiles, but all attachements are stripped on
> this reflector.
>
> It is all about the mass of the board and the chemistry of the paste.
> There is no ideal profile. Once you have one you like you may use this as a
> starting point, but if you showed us a profile, I would venture to say that
> there are no one on this reflector that could say with certainty that it
> was the right profile for your board. The proof is in the pudding.
>
> About 80 % of our boards are leadfree and we have found that the Ramp To
> Spike curve works best for us. Soaking tends to spend the flux too early.
> The Ramp must keep the delta temp across the board to a minimum. You must
> adjust the zones and the belt speed such that the profile is as short as
> possible while keeping the delta at a minimum.
>
> That is where your profiling starts.
>
> Good luck.
>
> -----------------------------------------
> Leif Erik Laerum
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Christopher Young
> Sent: Tuesday, December 13, 2011 4:17 AM
> To: [log in to unmask]
> Subject: [TN] Thermal profile for lead free
>
> Hi all,
>
>
>
> Could you give me some data on ideal temperature against ramp time for
> lead free profile.
>
>
>
> We have a 8 zone oven with profiles as follows. Are they both ok from a
> solder process point.
>
>
>
> At reflow zone Temp is at 220 c - 240c max for 30secs on one product.
>
>
>
> Any help or thoughts on thermal profiling would be great.
>
>
>
> Regards
>
>
>
> Chris
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 16.0 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 For additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
> ext.2815
> -----------------------------------------------------
>
>
> CONFIDENTIALITY NOTICE: This email and any attachments are Texas Memory
> Systems' proprietary material for the exclusive and confidential use of the
> intended recipient. If you are not the intended recipient, please do not
> read, distribute or take action in reliance upon this message. Any
> unauthorized disclosure is prohibited. If you have received this in error,
> please notify us immediately by return email and promptly delete all copies
> of this message and its attachments from your computer system.
>
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 16.0
> 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
> For additional information, or contact Keach Sasamori at [log in to unmask] 847-615-7100
> ext.2815
> -----------------------------------------------------
>
--
Best Regards,
*Reuven Rokah*
Mobile: 972-52-60-120-18
Tele-fax: 97239360688
<http://www.rokah-technologies.com/>[log in to unmask]
[log in to unmask]
www.rokah-technologies.com
**
This e-mail message is intended for the recipient only and contains
information which is CONFIDENTIAL and which may be proprietary of Rokah
Technologies. If you have received this transmission in error, please
inform me by e-mail, phone or fax, and then please delete all of the
original files and all other copies exist.
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0
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
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
