IPC-2221 curve fit for internal and external traces; nominal copper is 35 µm per oz/ft². Compare against manufacturer requirements and IPC-2152 for the actual board.
How to use
- Enter the dimensions and electrical values.
- Adjust the assumptions to match your components.
- Read the result and check the technical limits below.
Formula and assumptions
I = k × ΔT^0.44 × A^0.725; W = A/t; k = 0.048 / 0.024; A: mil²; t: mil.
Calculated example
- Current
- 2 A
- Copper weight
- 1 oz/ft²
- Temperature rise
- 10 °C
- External trace width
- 0.78144 mm
- Internal trace width
- 2.0329 mm