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Minimum Track and Spacing for Different Copper Weights | PCBasic

For rigid PCBs, it’s important to ensure that the minimum trace width and spacing comply with PCBasic’s manufacturing capabilities to guarantee both reliability and production yield. Please refer to the following specifications before submitting your design files.

The Minimum Track/Spacing for Outer Layer (Before Compensation)

Copper Weight	Normal Process	Medium Difficulty	High Difficulty
1 oz	≥ 5/6 mil	≥ 5/5 mil	< 4/4 mil
2 oz	≥ 7/8 mil	≥ 6/7 mil	< 5/6 mil
3 oz	≥ 10/12 mil	≥ 8/10 mil	< 6/9 mil

The Minimum Track/Spacing for Inner Layer (Before Compensation)

Copper Weight	Normal Process	Medium Difficulty	High Difficulty
1 oz	≥ 4/5 mil	≥ 4/4 mil	< 3.5/4 mil
2 oz	≥ 6/8 mil	≥ 6/7 mil	< 5/6 mil
3 oz	≥ 8/11 mil	≥ 8/10 mil	< 6/9 mil

Note:

At PCBasic, we strongly recommend designing your trace width and spacing to be above 6 mil (0.15 mm) whenever possible. This not only helps reduce manufacturing costs but also improves yield and process stability, especially for large-scale or high-layer-count PCB production.

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