TECHNET Archives

May 2005

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:
R Sedlak <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, R Sedlak <[log in to unmask]>
Date:
Mon, 16 May 2005 20:05:32 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (66 lines)
The answer is simply YES... you can have Tin/Lead, electroplated, on the pads--only.

However it is a major hassle, and with a short shelf life (as-plated Tin/Lead is not nearly as stable as HASL) why bother?

We have actually built soldermask strippers to accomodate exactly this type of board, I could never understand why someone would spec out this type of board...

Rudy Sedlak
RD Chemical Company

Stephen Gregory <[log in to unmask]> wrote:
This may seem like a strange question, but here it is:

Can a board have a tin/lead finish on the solderable surfaces when
SMOBC is called out, and comply with a note on the drawing that
SPECIFICALLY states that HASL is not allowed?

I have a fab vendor that's telling me that it's not possible. SMOBC without
HASL can't happen, if you want a tin/lead finish on the pads...is that
true?

I've been told that there will be some areas that will wind-up having a
tin/lead
finish beneath the soldermask, which we all know isn't a good thing because
of the loss of adhesion of the mask when the assembly goes thru reflow or
wave solder.

Kind regards,

-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
__________________________________________________________________
This message may contain information that is privileged and confidential to
LaBarge, Inc. It is for use only by the individual or entity named above.
If you are not the intended recipient, you may not copy, use or deliver
this message to anyone. In such event, you should destroy the message and
kindly notify the sender by reply e-mail.

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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
-----------------------------------------------------


---------------------------------
Do you Yahoo!?

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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
-----------------------------------------------------
 Yahoo! Mail - You care about security. So do we.

ATOM RSS1 RSS2