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Why does the US target “14nm” for sanctions?

techcossack

techcossack

Banned
I know that most of these process nodes are marketing terms that do not represent gate length or half pitch, so when I read that the US was sanctioning the 14nm node, I kinda wondered “why this node?”. Does anyone know? The wording seems pretty vague to me.

Plus, in terms of lithography machines, the DUV machine possessed by SMIC can produce a wide range of nodes anyway. So if ASML stopped shipping it, does it mean SMIC will also lose access to older process nodes?
 
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