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並前往https://www.we-online.com/web/en/index.php/show/media/04_leiterplatte/2011_2/relaunch/produkte_5/microvia_hdi/180924_WE_CBT_DesignGuide_HDI-12_EN_screen.pdf

HDI Design Guide - Würth Elektronik

the aspect ratio is too critical or the drill diameter is too small then ... decrease the microvia pad size, at least on the inner layers, to 275 µm.

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