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
>
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