Paul

There isn't an IPC spec yet.

If your fabricator is reputable (and if they weren't, you wouldn't be using
them) they should be able to provide you with a spec that works.  One thing
to note is that all immersion silver chemistries don't give the same
thickness.  For instance MacDermid Sterling Silver will give a thickness
between 5 microinches and 25 microinches, but Enthone Alpha Level will
result in 3 to 8 microinches.

Mike McMaster
RF Product Engineer
Merix Corporation
503-992-4263



> ----------
> From:         Black, Paul[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Black, Paul
> Sent:         Wednesday, September 17, 2003 11:13 AM
> To:   [log in to unmask]
> Subject:      [TN] Immersion Silver
>
> Hi Everyone,
>
> Due to some fine pitch components and a couple of BGA' s on my boards, I
> am looking into changing the finish from HASL to Immersion Silver. The
> fabricator has asked what thickness of Silver I would like. Is there an
> IPC spec that governs this?
>
> Thank you,
> Paul Black
> Manufacturing Engineer
> Kronos
> E-mail: [log in to unmask]
> Voice: (978) 947-1520
> Fax: (978) 244-0568
> www.kronos.com
> Improving the Performance of People and Business(tm)
>
>
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