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Plated half holes which is also called castellated holes, they’re normally designed at the edge of printed circuit boards and plated with copper, and they’re mainly used for board-on board connections, mostly where two circuit boards with different technologies are combined.

Most of the plated half hole PCBs are a type of modules which are small and high density with fine pitch components, this type of circuit boards are made with GPS Modules, Wifi Modules, Bluetooth Modules, GMS Modules, GPRS Modules and other smart modules.

Basically plated half holes are not suitable for V-score process, because the copper at the hole will be rolled up to cause serious burs, routing process is a better solution to ensure smooth edge.

The guidelines of designing plated half holes

● Normally the minimum half hole size is 0.8mm, it can be min 0.55mm with A-TECH capability
● The routing tolerance for half hole is +/-0.15mm
● The minimum distance from pad to pad is 0.25mm
● Use the larger hole diameter if possible
● Use the larger outer layer pad on both sides if possible
● Connect inner layer pads to the plated holes if possible to bring more stability and help to avoid burrs.
● Routing process is preferred and ENIG finish is preferred.

A-TECH have manufactured a large number of printed circuit boards with half hole design for various module products, and we have obtained rich experience to control high quality, the minimum half hole size we can build is 0.55mm.

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The quality control of A-TECH countersink pcb is conducted rigorously. It is tested in terms of its air circulation, surface treatment, as well as the most important part, thermal dissipation performance. Thanks to the up-to-date vacuum DES line, it is manufactured with fine traces and high density

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The law of heat conduction theory has been adopted in the developing of A-TECH press fit pins pcb. It's specially made to allow the heat to be transferred from the higher temperature region to the lower temperature region. The product has dynamic and mechanical stability

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The surface treatment of A-TECH countersink pcb mainly includes degreasing, anodizing, sandblasting, painting, and laser engraving. It has to go through surface inspection to guarantee burr free. It is offered with low dielectric loss

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During the production of A-TECH countersink pcb, the accuracy of machining and grinding, surface roughness, concentricity, and verticality are all strictly scrutinized to guarantee high quality. It can be printed with numbers, names, data codes, logos, or other specific information

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In order to meet the standards of the heatsink industry, A-TECH press fit pins pcb has to go through a strict inspection process conducted by precise inspection equipment. It is vacuum-sealed, which can greatly reduce the bulk of the overall cargo

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The product is efficient in thermal dissipation. The material used in it features excellent heat conducting and it is thermally efficient. It has increased power densities which guarantee its long service life

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