Hi Ronny,

Nickel and gold thickness in the barrel will and should be close to the same
thickness as the nickel and gold thickness on the rest of the board.  The
mechanisms for corrosion are the same in a microvia as they are on the
surface of the board, and varying the thickness would be impractical even if
it wasn't.

By the way, those thickness' are 100 to 200 micro inches of nickel and 3 to
5 micro inches of gold.

Kind Regards

Ryan Grant
Advanced Technology Engineer
MCMS
(208) 898-1145
[log in to unmask]


> -----Original Message-----
> From: Ronald Rea [SMTP:[log in to unmask]]
> Sent: Wednesday, September 26, 2001 2:37 PM
> To:   [log in to unmask]
> Subject:      [TN] Nickel/Gold in microvias
>
> Hello people of TechNet,
>
> What is the minimum nickel and gold thickness in the bottom of micro-vias.
> IPC 6012 doesn't seem to be very specific on that point.
>
> On the surface, a minimum of 50 microinch seems sufficient, but how does
> this garantee corrosion protection in the barrel of the blind vias?
>
> Your toughts please,
>
> Thanks,
>
> Ronny.
>
>
>
>
>
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