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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