" It depends" (where is Dough Pouls, not seen much of him for a time) on
what is written in the procurement document, the solder mask manufacturer's
recommendation, and the dielectric withstanding voltage requirement,
possibly also depending on national diversity. Some think that Mil and Nasa
automatically means thicker mask. Not always the case. Space equipment of
the kind optical ones demands as little outgassing as possible, which can
result in a solder mask as thin as 5 micrometers. If then the system
voltage is only 3 VDC, 5 microns may be satisfying. In other cases, the
system voltage may be so high that you need up to 100 micrometers. My
experience from MIL/SPACE is that the thickness use to be within 10-50
micrometers.  There will be more comments from the guru kernel.

Inge



On 1 March 2013 16:31, Ramakrishnan Saravanan <[log in to unmask]> wrote:

> Dear all,
>
> What is the  solder mask thickness required for Avionics Systems.
>
> Is coverage alone sufficient for the PCBs used in rockets and satellites.
>
> What is the NASA's requirement for solder mask thickness ?.
>
> regards,
>
> R.Saravanan
>
>


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