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Blind / Buried Vias

Definition
Blind Vias start on an outer layer but terminate on an inner layer; Buried Vias exist only between inner layers and do not begin or terminate on an outer layer.

Applications
Blind and buried vias are real estate savers because features and lines can be designed above or below (without making a connection).

Common Issues
Laser drill, voids-desmear / deash, hole preparation, copper plating.
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Cross Sections
In-house lab features small hole accessory for microsectioning Cu-PTH vias.
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