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Copper Thickness and Minimum Structure Size

5pcb.de GmbH offers PCBs with a copper thickness of 18μm, 35μm, 70μm and 105μm as standard. Special production can receive up to 400μm of copper.

Below, based on the IPC-A-600 directive, you will find tables for minimum copper thicknesses in production:

Minimum thickness of copper for outer layers of plated-through printed circuit boards

WeightThicknessAbsolute Minimum acc. IPC-4562Min. Copper for Class 1 und 2Min. Copper for Class 3Max. Reduction in productionMin. finished thickness Class 1&2Min. finished tickness Class 3
1/2 oz.18µm15,40µm20µm25µm2,00µm33,40µm38,40µm
1 oz.35µm30,90µm20µm25µm3,00µm47,90µm52,90µm
2 oz.70µm61,70µm20µm25µm3,00µm78,70µm83,70µm
3oz.105µm92,60µm20µm25µm4,00µm108,60µm113,60µm
4oz.140µm123,50µm20µm25µm4,00µm139,50µm144,50µm

Minimum thickness of copper of single-sided printed circuit boards

Copper weightCopper thicknessAbsolute Minimum acc. IPC-4562Max. Reduction in productionMin. finished thickness Class 1&2
1/2 oz.18µm15,40µm2,00µm13,40µm
1 oz.35µm30,90µm3,00µm27,90µm
2 oz.70µm61,70µm3,00µm58,70µm
3oz.105µm92,60µm4,00µm88,60µm
4oz.140µm123,50µm4,00µm119,50µm

Minimum thickness of copper for inner layers

Copper weightCopper thicknessAbsolute Minimum acc. IPC-4562Max. Reduction in productionMin. finished thickness Class 1&2
1/2 oz.18µm15,40µm4,00µm11,40µm
1 oz.35µm30,90µm6,00µm24,90µm
2 oz.70µm61,70µm6,00µm55,70µm
3oz.105µm92,60µm6,00µm86,60µm
4oz.140µm123,50µm6,00µm117,50µm

As minimum structure sizes, the following minimum sizes are required for the different copper thicknesses:

Copper weightCopper thicknessLineSpace line to lineAnnular ring
1/2 oz.18µm≥ 75µm≥ 75µm≥ 75µm
1 oz.35µm≥ 125µm≥ 125µm≥ 125µm
2 oz.70µm≥ 175µm≥ 175µm≥ 175µm
3oz.105µm≥ 200µm≥ 200µm≥ 200µm
4oz.140µm≥ 250µm≥ 250µm≥ 250µm

If you need smaller structures than the given one, this may also be possible after examining the individual case and possibly optimizing your design, ask us and we will examine your request.

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