Ken Fong wrote:



> Dear Technetters,

> Is MIL-P-13949 already obsolete and replaced by MIL-S-13949? If yes, what's the

> most up-to-date revision of MIL-S-13949? Where to find an official check of this

> ? Pls advise. Thx.

>

> Ken

>

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Ken,

    IPC-4101 replaces MIL-S-13949 for rigid & multilayer boards. IPC-4104 is used for HDI &

microvia materials.



Fred Elsis