Why trace width matters
PCB traces have resistance. When current flows through copper, heat is generated.
Main parameters
The required width depends on current, copper thickness, ambient temperature, allowed temperature rise and board stackup.
Copper thickness
Standard copper thickness is often specified in ounces. 1 oz copper is approximately 35 µm thick.
Voltage drop
For high-current designs, voltage drop can matter as much as temperature.
Practical design notes
Use conservative margins for power electronics, battery systems, motor drivers and LED power boards.
Use the calculator
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Open PCB Trace Width CalculatorFrequently asked questions
What is covered in PCB Trace Width Guide for Current Carrying Tracks?
This guide explains the concept, formula, practical examples and design notes for electronics engineering work.
Can I use this guide for production hardware?
Use it for learning and early estimates. Production hardware should always be verified with datasheets, simulations and real measurements.
Is there a related calculator?
Yes. EngiCalc guides link to relevant calculators so you can test values directly in the browser.
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