PCB Trace Width Calculator
This calculator is designed for electronics engineers who need to determine the optimal trace width for a PCB to ensure reliability and safety. By inputting the required current, temperature rise, and copper thickness, users can compute the necessary trace width to prevent overheating and ensure efficient operation.
Trace Width Calculator
Results
Data Source and Methodology
All calculations are based on the IPC-2221 standards for PCB design. For detailed specifications, please refer to the IPC-2221 document available at IPC.org. All calculations strictly adhere to the formulas and data provided by this source.
The Formula Explained
Glossary of Variables
- Current: The amount of electric current in amperes.
- Temperature Rise: The allowable increase in temperature due to current flow.
- Copper Thickness: The thickness of the copper layer on the PCB, measured in ounces.
How It Works: A Step-by-Step Example
For a current of 2A, a temperature rise of 20°C, and a copper thickness of 1oz, the trace width is calculated as follows:
\[ \text{Trace Width} = \frac{2 \times 1.2}{1 \times 20} = 0.12 \, \text{mil} \]
Frequently Asked Questions (FAQ)
Why is PCB trace width important?
PCB trace width is crucial to ensure the current can safely pass through without overheating or causing damage.
How do I choose the right copper thickness?
The copper thickness is usually determined by the manufacturer, but higher thickness can handle more current.
What is the impact of temperature rise on trace width?
Higher temperature rise can lead to wider traces to dissipate heat effectively.
Can I use this calculator for multi-layer PCBs?
Yes, but ensure each layer's parameters are correctly accounted for based on your design specifications.
Where can I find more information on PCB design standards?
Refer to the IPC-2221 standards available at IPC.org.
Formula (LaTeX) + variables + units
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\text{Trace Width} = \frac{\text{Current} \times 1.2}{\text{Copper Thickness} \times \text{Temperature Rise}}
\text{Trace Width} = \frac{2 \times 1.2}{1 \times 20} = 0.12 \, \text{mil}
\[ \text{Trace Width} = \frac{\text{Current} \times 1.2}{\text{Copper Thickness} \times \text{Temperature Rise}} \]
- No variables provided in audit spec.
- IPC.org — ipc.org · Accessed 2026-01-19
https://www.ipc.org/
Last code update: 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.