Drills & Throughplating

A unique differentiation in your data between plated-through holes (PTH) and non plated- through holes (npth) is of fundamental importance! This means that you must output a separate drilling program for pth- and npth drill holes, for example, for Excellon or Sieb&Meyer data. For multilayers, this also applies for blind and buried vias. ODB++ data contain the necessary information automatically!

Attention:

The hole diameter indicated by the customer represent the final diameter!
Please specify component holes ≤ 0.5mm with your order!

Producible hole diameters

Type	Smallest Ø	Largest Ø	Max. aspect ratio
Type	Drill hole npth	Smallest Ø	200µm	Largest Ø	6,0mm (larger = milling)	Max. aspect ratio	1:10 (rfq 1:12)
Type	Drill hole pth	Smallest Ø	75µm*	Largest Ø	6,0mm	Max. aspect ratio	1:12
Type	Blind via**	Smallest Ø	75µm*	Largest Ø	0,4mm	Max. aspect ratio	1:1 (rfq 1:1,2)
Type	Buried via	Smallest Ø	75µm*	Largest Ø	0,4mm	Max. aspect ratio	1:12

_{* Final diameter after surface finishing!
** Not possible with HAL surface!}

Aspect ratio

The aspect ratio indicates the relationship between the technically producible final diameter depending on the material thickness. Multi-CB can produce aspect ratios up to a maximum of 1:12, for blind vias 1:1,2.

Sample aspect ratios

Material thickness	drill-Ø min	final-Ø min.*
Material thickness	6,0mm	drill-Ø min	600µm	final-Ø min.*	550µm
Material thickness	3,0mm	drill-Ø min	300µm	final-Ø min.*	250µm
Material thickness	2,0mm	drill-Ø min	200µm	final-Ø min.*	150µm

_{* Final diameter after through-plating}

Tooling / assembly holes (npth)

Tooling or assembly holes (normally with diam. = 3.05mm) should be placed in the same drilling program as pth drill holes, by the customer. Thus, there are no additional tolerances for re-placement into the drill- / milling machine.

Component holes

It is normally advisable to select a hole diameter in the upper tolerance region of the corresponding part. You should design the annular rings as large as possible.

Please note:

Please specify component holes ≤ 0.5mm with your order!
Component holes ≤ 0.6mm must be manufactured with a chemical surface, otherwise these holes will be filled with tin during the HAL process!