We use ENIG and it hasn't increased the board cost.
Our board house has made ENIG their standard and Immersion Silver
would have increased our cost.
Talk to the board house that is usually used and find out what their
standard is.

The material we use is FR4 IPC 4101/24

Ray Johnston
Lead CAD Designer
Rane Corporation
425-355-6000
rayj@rane,com

----- Original Message -----
From: "Fred Dark" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, January 18, 2006 9:42 AM
Subject: Re: [DC] RoHS board finish


> enig...!
>
> -----Original Message-----
> From: Robert Walker [mailto:[log in to unmask]]
> Sent: Wednesday, January 18, 2006 12:39 PM
> To: [log in to unmask]
> Subject: [DC] RoHS board finish
>
>
> Hi All,
>
> I'm doing my first PCB design that will use lead-free components and I
> need
> to change my board finish from what I've always used.....HASL. I'm looking
> for
> any recommendations or comments on the best board finish to use.
>
> The components used on the design will be a mixture of tin-lead and
> lead-free (SAC), so I'm not sure if there is a preferred finish to use in
> this  type
> of situation. I work in a prototype environment where the boards may be
> reworked (BGA removal/replaced) a number of times, so I'm concerned about
> the
> ability of the finish being able to handle being  reworked/reflowed a
> number of
> times.
>
> I'd also welcome any recommendations on the type of board material to use
> since it will see an elevated temperature of up to 260C. I've always just
> specified FR4 in the past.
>
> Thanx in advance for any feedback.
>
> Regards,
> Bob Walker
> [log in to unmask] (mailto:[log in to unmask])
>
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