TECHNET Archives

November 2006

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:
Deac Descoteaux <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Deac Descoteaux <[log in to unmask]>
Date:
Tue, 21 Nov 2006 12:22:14 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (134 lines)
Frank,

Acid is like rust.....it never sleeps! The acid will continue, albeit, at a
slow rate, to eat away at the etch. It will take time, but it will happen.
The biggest problem is that it is one of the most difficult failures to find
on a board.

Deac

Deac Descoteaux
 
PalPilot, East Coast Corporation, (PEC)
Director of New Business Development
71 Spitbrook Road, Suite #307
Nashua, NH   03060
office #     (603) 888-3400, ext. #10
Toll Free # (877) PALPILOT, (725-7456)
Fax #         (603) 888-3500
Cell Phone# (603) 557-7568
email address: [log in to unmask]
www.palpilot.com
 
PCB LAYOUT * SIGNAL INTEGRITY * PCB FABRICATION * METAL CHASSIS * PLASTIC
MOLD INJECTION * BACKPLANE SOLUTION * CONNECTORS
 

The information contained in this communication including any attachments is
intended solely for the use of the individual or entity to whom it is
addressed and others authorized to receive it. This communication may
contain information that is privileged, confidential and exempt from
disclosure under applicable law. If you are not the intended recipient you
are hereby notified that any disclosure, copying, distribution or taking any
action in reliance on the contents of this information is strictly
prohibited and may be unlawful. If you have received this communication in
error, please notify us immediately by responding to this email and then
delete it from your system. No printed copies should be made or retained.
Thank you.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Frank Kimmey
Sent: Tuesday, November 21, 2006 12:10 PM
To: [log in to unmask]
Subject: Re: [TN] Acid Traps

John,
In todays world, if a PCB is properly cleaned after etch, deposition and
prior to mask, then acid traps should not be a concern.
We do a lot of weird angle stuff in the RF world and I have never seen a
failure due to acid trap type issues.
Bottom line is if your fabricator has good process then it should not be
an issue, but to keep risk to a minimum good design practice should be
followed when possible.
Hope it helps,
FNK 

Frank N Kimmey CID+
Principal PCB Designer
PCB Programs
Powerwave Technologies Inc
Office 916-941-3159
Fax 916-941-3195
Mobile 916-670-0645

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Foster
Sent: Tuesday, November 21, 2006 8:53 AM
To: [log in to unmask]
Subject: [TN] Acid Traps

I would like to ask the board fabricators if acid traps are a real
issue.

I normally try to avoid any feature that creates a structure that is
less
then 90 degrees.

However I am helping out another group by reviewing their boards and
there
are literally
hundreds of acid traps on the board. This board is class 3 and has to be
high reliability.

I have always been taught that they can be a real problem. But have
never
quite understood
why.

Any input on this will really be appreciated.

Thanks
John Foster

---------------------------------------------------
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
-----------------------------------------------------

---------------------------------------------------
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
-----------------------------------------------------

---------------------------------------------------
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
-----------------------------------------------------

ATOM RSS1 RSS2