Scott,
What surface? You mean the MCPCB? And what is 0.1 resp. 0.2 and 0.4 ?  Is
that the asperity in micro inches? Why do your customer bother? Are they
worried about the heat transfer? Calculating Rth one use to consider the
asperity. To keep Rth as low as possible is of crucial interest for the
life of high current LEDs but hardly for the small ones that you see as
indicator lamps on boards for home electronics. So, is this a super candela
LED?

Inge



On 3 November 2011 19:44, Scott Westheimer <[log in to unmask]> wrote:

> I have a customer asking if we can meet average surface of 0.1,0.2 or 0.4
> with a HASL finish. We are considering using annealed copper to start with
> but with HASL finish is that neccessary. The pad is for a LED.
>
> Regards,
>
> Scott
>
> Scott Westheimer
> Account Manager
> Cell: + 1(919)800-1876
> Email: [log in to unmask]
> [log in to unmask]
> Skype: scott.westheimer
>
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