Right, if you know dark paths of ENIG, you can use it up to 60 GHz! We
did. After ENIG, another layer of Cu and Au. No, I don't tell about
thicknesses.
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Dwight Mattix
Skickat: den 13 juni 2007 20:25
Till: [log in to unmask]
Ämne: Re: [TN] Nickel barrier and RF applications
The lossy effects of Ni are long established. However, many successfully
use it at high freq.
In many (most?) cases the Ni effects can be modeled and tuned in circuit
design.
fwiw, We have a satcom mobile earthstation app with complex microstrip
filters and couplers running at 14GHz on ENIG.
Going on 20 years now and still producing/updating the system, still
using
ENIG.
for the record:
ENIG is the worst surface finish we've ever used.
Except for everything else we've tried. ;^)
dw
At 10:57 AM 6/13/2007, Stadem, Richard D. wrote:
>Inge and Vlad
>Keep in mind that Paymon is reflowing the entire assembly, not just
>reworking a BGA site.
>Therefore what you just described is happening over the entire assembly
>to all of the solder joints.
>This cumulative effect could theoretically create a noticeable
>improvement in the RF performance of the circuitry.
>
>-----Original Message-----
>From: Hfjord [mailto:[log in to unmask]]
>Sent: Wednesday, June 13, 2007 12:13 PM
>To: 'TechNet E-Mail Forum'; Stadem, Richard D.
>Subject: SV: [TN] Nickel barrier and RF applications
>
>For each repeated reflow, more and more nickel participates in building
>nickel/tin intermetallics. These IMCs are not ferromagnetic. So, let's
>assume that Paymon's electroless nickel is just some 2-3 micrometers
>thick, which is not unusual, then a growth of the IMC by some 0.1 to
0.5
>micrometer for each reflow will probably have a positive effect = less
>magnetic.
>Just an analogue thought
>Inge
>
>
>I think, there is one question to ask. If ENIG (or rather the presence
>of Ni) is the source of the problem, then why does 2nd reflow improves
>the yield?
>
>
>Regards,
>
>Vladimir
>AMD
>
>---------------------------------------------------
>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
-----------------------------------------------------
|
