What are Plated Half-Holes（Castellated Holes）

Plated half holes（castellated holes）are holes that made off the edge of the boards plated with

copper using a specialized process. It is predominantly used for board-on-board connections, mostly where two printed circuit boards with different technologies are combined.

Through connecting the PCBs together directly, the whole system is considerably thinner than a comparable connection with multi-pin connectors.The plated edges are also useful in producing mini PCB modules.

Plated half holes are available in both standard PCB and advanced PCB. For standard PCB service, the minimum diameter of castellated holes A is 0.6 mm 0.4mm (update 2022   the minimum hole of 0.4mm is related to the thickness of the board, and it is also related to the number of holes in the board). If you need smaller castellated holes pleaseask our sale to offer advanced PCB service.  And the minimum distance between two Plated half holes B is 0.55mm(default),0.47mm ~ 0.55 mm(Price will increase and lead time will be extended.)(2022).

So how to manufacture the Plated half holes? The plating is protected from mechanical damaging by setting back the copper shell.Therefore the plated half-holes can be milled precisely and improve the process reliabilitystrongly

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