Gaby,
I may not be clear what you're trying to achieve - are you trying to make
boards with as thick a Nickel layer as it's possible to produce, or do you
have boards that have a very heavy Nickel layer in your possession that are
giving you problems?
If you want to share the pictures you have with TechNet to get a more
informed response, e-mail them to Steve Gregory and he'll put them onto the
web site he created for this purpose.
Best wishes
Pete Duncan.
Gabriela Bogdan
<gabriela@NETVISI To: [log in to unmask]
ON.NET.IL> cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
Sent by: TechNet Subject: Re: [TN] Ni thickness
<[log in to unmask]>
06/05/01 02:07 PM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to
Gabriela Bogdan
Thank you for your answer, Pete.
Yes, this board has 10 um Ni under electroless gold, on pads , in through
holes and in microvias. Until now
we got boards with~ 4um Ni thickens. This is a new supplier, and though I
made 2 cross sections on 2
different boards, he suggests that this thickness is impossible to reach in
his process. I am confused. Got
pictures, and even comparing visually with the base copper layer of 1/2 oz,
it is more than half its
thickness.
Thank you,
Gaby
"" wrote:
> Hi, Gaby,
>
> I don't know about an upper limit, but the assembly shop tut-tutted and
> shook its collective head at 150 microinches of Nickel on one of our
> boards. They remarked that it was rather a heavy layer that might prove
> more difficult to achieve good wetting on.
>
> I would guess there is a thickness limit, though, depending on the track
> width. The thicker the layer, the easier it is to physically damage, and
> the greater its effect on signals, capacitances, etc. Do you have a
> flatness problem with your board, or have you been presented with one
that
> looks to have an unusually thick layer?
>
> Pete Duncan
>
> Gabriela Bogdan
> <gabriela@NETVISI To: [log in to unmask]
> ON.NET.IL> cc: (bcc: DUNCAN
Peter/Asst Prin Engr/ST Aero/ST Group)
> Sent by: TechNet Subject: [TN] Ni
thickness
> <[log in to unmask]>
>
> 06/05/01 05:10 AM
> Please respond to
> "TechNet E-Mail
> Forum."; Please
> respond to
> Gabriela Bogdan
>
> Dear Technetters,
> I am in the process of evaluation of a PCB.
> Urgent!
> Is there an upper limit for electroless nickel on ENIG boards?
> Please helpme with your experience!
> Gaby
>
>
---------------------------------------------------------------------------------
>
> Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
> 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 delivery of Technet send the following message: SET
> Technet NOMAIL
> Search previous postings at: www.ipc.org > On-Line Resources & Databases
>
> E-mail Archives
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
> ext.5315
>
---------------------------------------------------------------------------------
>
>
---------------------------------------------------------------------------------
> Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
> 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 delivery of Technet send the following message: SET
Technet NOMAIL
> Search previous postings at: www.ipc.org > On-Line Resources & Databases
> E-mail Archives
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
>
---------------------------------------------------------------------------------
---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
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 delivery of Technet send the following message: SET
Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases >
E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
---------------------------------------------------------------------------------
---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
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 delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------
|
