John,
You call HASL smooth?! It certainly isn't flat by any stretch of the
imagination. Anything is flatter than HASL.
The only time I have seen a smoothness spec (well roughness spec) for a
board surface finish was when I was at Nortel and there was a daughter
board that was going to be pushed in and out of a connector several
times over its lifetime and there some concern that a rough gold finish
could wear away the contact surface in the connector.
1) No you cannot HASL with Silver. Silver melts at 961.78C. This is a
tad hot for the board epoxy.
2) See second paragraph.
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Babcock John
Sent: November 10, 2005 4:09 PM
To: [log in to unmask]
Subject: [TN] plating smoothness
Does anybody call out a specific smoothness finish ever on a fabrication
dwg for the HASL? In these days of lead free, going forawrd, I am
wondering if silver will have the same smoothness finish as SN63/PB37
using HASL?
1) Or can you HASL with silver?
2) Does anyone have an example of a fab note for such a callout? Or is
this getting too specific?
John Babcock
PCB Designer III
Isothermal Systems Research (ISR)
2218 N. Molter Rd
Liberty Lake, WA 99019
[log in to unmask]
P: (509) 241-4641
F: (509) 444-1082
This E-mail and any files transmitted with it are confidential and
proprietary in nature and intended solely for the use of the individual
to whom it is addressed. If you have received this E-mail in error,
please send it back to the person that sent it to you. Any views or
opinions presented are solely those of its author and do not necessarily
represent those of Isothermal Systems Research, Inc. Unauthorized
publication, use, dissemination, forwarding, printing or copying of this
email and its associated attachments is strictly prohibited. Thank you
for your cooperation.
---------------------------------------------------
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
-----------------------------------------------------
---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.
---------------------------------------------------
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
-----------------------------------------------------
|
