Hi Inge! Yes, that report was a collaborative effort and was published at
one of the IPC EXPO conferences so it is in the public domain, available
to anyone. The use of ENIG does not mean that you can't have RF type
circuits, it just means the designer needs to understand what the nickel
is doing to the signal. Other design factors push the RF signal around too
(e.g. copper trace dimensions). The design folks say RF stands for "Radio
Frequency", I believe it really means "Really Freaky".
Dave
Hernefjord Ingemar <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
06/13/2007 09:04 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Hernefjord Ingemar <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] Nickel barrier and RF applications
Paymon
Rockwell-Collins, Taconic, McDermid and HP investigated Nickel vs. RF. I
can possiblysend the whole report to you offline. But first, whom are
you working for? I'll ask Dave Hillman also, don't know if this report
is official or not.
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani
Sent: den 13 juni 2007 15:57
To: [log in to unmask]
Subject: [TN] Nickel barrier and RF applications
Hello John, is it documented anywhere?
Paymon
-----Original Message-----
From: John Burke [mailto:[log in to unmask]]
Sent: June 13, 2007 9:53 AM
To: 'TechNet E-Mail Forum'; Paymon Sani
Subject: RE: [TN] Plating
The nickel in enig is not good for frequencies above 3 - 4 GHz
John Burke
(408) 515 4992
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani
Sent: Wednesday, June 13, 2007 6:47 AM
To: [log in to unmask]
Subject: Re: [TN] Plating
Hello Inge,
This is very interesting! I did not make the connection between the
Nickel on the PCBs and the RF application. Are there any papers that
explain the sensitivity of RF applications to the Nickel barrier in ENIG
PCBs?
We are having trouble with a 5.8 GHz RF product right now. The assembly
meets the IPC-610D requirement. However, 25% of the products fail
testing. We reflow the failed assemblies for the 2nd time and 50% of
them pass testing! We do not know the RC of the failures. I was
suspecting the flux to be the root cause but could it be the Nickel
barrier?
Cheers,
Paymon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: June 13, 2007 2:33 AM
To: [log in to unmask]
Subject: Re: [TN] Plating
Paul,
Lockheed Martin use a lot of platings. I'm not sure, but I have seen
Boron as a barrier somewhere, just can't find it right now. Anyway,
Lockheed as well as NASA use many special platings. Non-magnetic, guess
you have a RF application that need low-loss lines.
http://supplier.external.lmco.com/supplier/po_information/specpro2.htm
I was myself looking for a non-magnetic finish once, and if I remember
right, there is a difference between EN and EN. The acidous electroless
nickel is not ferromagnetic, while alcaline electroless nickel is
somewhat ferromagnetic.
Borohydride electroless Nickel-Boron is probably non-magnetic too.
However, you should contact your plating chemist to verify, it was many
years since I mixed with this. (In earlier days, we had our own
chemists, many of them had piles of knowhow, but then came the
economist's era, and the chemists were kicked out)
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stolar, Paul W
Sent: den 12 juni 2007 23:38
To: [log in to unmask]
Subject: [TN] Plating
We are using nickel as a barrier metal on a PC board for the pads.
Are there any other barrier metals we can use which are non-magnetic.
Bare copper is not an option.
Paul Stolar
Materials/Reliability Engineer
Manufacturing Reliability Lead Engineer
Baker Atlas
713-625-5376
713-625-4949 (fax)
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 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 15.0 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
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
-----------------------------------------------------
------------------------------------------------------------------------
----
-----------
Confidentiality Notice
This e-mail and any attachment(s) are intended for the individual or
entity to which this email is addressed and may contain information that
is confidential. If you are not the intended recipient or an employee
or agent responsible for delivering this e-mail to the intended
recipient, please be aware that any dissemination, distribution or
copying of this communication is strictly prohibited. If you have
received this in error, please notify the sender by telephone at
604.430.4336 or by return e-mail, and please delete or destroy all
copies of this communication. Thank you!
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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
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
-----------------------------------------------------
------------------------------------------------------------------------
---------------
Confidentiality Notice
This e-mail and any attachment(s) are intended for the individual or
entity to which this email is addressed and may contain information that
is confidential. If you are not the intended recipient or an employee
or agent responsible for delivering this e-mail to the intended
recipient, please be aware that any dissemination, distribution or
copying of this communication is strictly prohibited. If you have
received this in error, please notify the sender by telephone at
604.430.4336 or by return e-mail, and please delete or destroy all
copies of this communication. Thank you!
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 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 15.0
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
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 15.0
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
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
-----------------------------------------------------
|