Minimum Trace / Space Width

Minimum trace width and minimum space width are important PCB fabrication parameters. They affect manufacturability, routing density, electrical performance, and production yield. Based on the original page information, the minimum trace / space width we can fabricate is 4 mil / 0.1 mm.

What Are Trace Width and Space Width?

A PCB trace, also called a track or copper trace, is the electrical connection formed by copper between PCB pads and electronic components.

Trace width means the width of the copper line. Space width means the clearance or gap between two copper features.

Trace width influences electrical resistance and current carrying capability. Space width influences routing density and manufacturing safety margin.

Quick understanding:
Trace = the copper line itself.
Space = the gap between copper features.
The smaller the trace / space, the more demanding the PCB fabrication process becomes.

Basic Capability

According to the original page information, the minimum PCB trace / space width we can fabricate is 4 mil / 0.1 mm.

Note: This value is carried over from your original page. You should confirm that 4 mil / 0.1 mm is still your current manufacturable capability before using this page as a formal FAQ reference.

Why Trace / Space Matters

  • Trace width affects electrical resistance and current carrying capability.
  • Trace / space values affect routing density on the PCB layout.
  • Narrower trace and space generally require tighter manufacturing control.
  • Very fine trace / space may influence cost, yield, and lead time.

How to Choose Proper Trace / Space Width

Factor Recommendation
Current requirement Use wider traces when the circuit needs higher current carrying capability.
Routing density If the board is dense, smaller trace / space may be needed, but manufacturability must be considered.
Board size and layout Smaller boards may force tighter routing, so design trade-offs are important.
Manufacturing capability Avoid unnecessarily small trace / space values when standard values can work reliably.
Note: The best trace width is not always the minimum trace width. Designs should balance electrical performance, manufacturability, and cost.

Design Tips

  • Use the narrowest trace only when necessary.
  • Keep enough spacing to reduce manufacturing risk.
  • For high current paths, wider trace width is usually better.
  • For very fine trace / space designs, contact us before placing the order.

Illustrations

PCB minimum space illustration
Illustration of PCB minimum space requirement.
PCB minimum trace width illustration
Illustration of PCB minimum trace width requirement.
If your design has very fine trace / space requirements, please contact us with your PCB files for review.
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