---------Included Message----------
>      From: <[log in to unmask]>
>      Subject: Re: [DC] Blind and Buried Vias
>      The 0.005 and 0.002 numbers that you quote are not new. They were
listed in
>      IPC-D-275 under "military requirements."

Hi Gary,

No, these numbers aren't new. Actually they are from the ipc-d-275
(old!) document. What's new are the numbers (if you'll read my previous
message again) in ipc-2221 which have been halved (.0025"/.001") from
what they were in 275. I would like to ask you why it was deemed ok by
ipc to lop off (cut in half) the annular ring "design recommendation".

BTW, I most always design by the minimum ipc recommendations, because
they still tend to be very conservation. Just my opinion, and I don't
argue with any of the "recommendations".

Have a great day.

Mitch
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