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Copper foil thickness during PCB design
Copper foil thickness during PCB design

# Copper foil thickness during PCB design

2021-11-02
View：155
Author：Kavie

The current carrying capacity of copper foils of different thicknesses and widths is shown in the following table:

Copper skin thickness 35um Copper skin thickness 50um Copper skin thickness 70um
Copper skin t=10 Copper skin t=10 Copper skin t=10
Current A width mm Current A width mm Current A width mm
6.00 2.50 5.10 2.50 4.50 2.50
5.10 2.00 4.30 2.00 4.00 2.00
4.20 1.50 3.50 1.50 3.20 1.50
3.60 1.20 3.00 1.20 2.70 1.20
3.20 1.00 2.60 1.00 2.30 1.00
2.80 0.80 2.40 0.80 2.00 0.80
2.30 0.60 1.90 0.60 1.60 0.60
2.00 0.50 1.70 0.50 1.35 0.50
1.70 0.40 1.35 0.40 1.10 0.40
1.30 0.30 1.10 0.30 0.80 0.30
0.90 0.20 0.70 0.20 0.55 0.20
0.70 0.15 0.50 0.15 0.20 0.15

Note 1 The current carrying capacity of the copper foil width when using copper as a conductor to pass a large current should refer to the value in the table to derate by 50% to select and consider

Depend on
Since the thickness of the copper foil of the copper-clad board is limited, the current carrying capacity of the copper foil should be considered in the strip copper foil that needs to flow a larger current. The typical 0.03mm is still used
Take the thickness as an example, if the copper foil is used as a strip wire with a width of W (mm) and a length of L (mm), its resistance is 0.0005*L/W ohm.
In addition, the current carrying capacity of the copper foil is also related to the type, quantity and heat dissipation conditions of the components mounted on the printed circuit board. In consideration of safety,
Generally, the current carrying capacity of copper foil can be calculated according to the empirical formula 0.15*W(A).

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The calculation method of the width of the copper skin of the PCB circuit board and the amount of current flowing

Generally, when the thickness of the copper foil of the PCB board is 35um and the line width is 1mm, the cross-sectional area of the line is 0.035 square millimeters, and the current density is usually 30A/square millimeter. Therefore, 1A current can flow per millimeter of line width.

There is a calculation formula in the IPC275-A standard. It is related to the temperature rise, the thickness of the copper foil, and A.

I = 0.0150(DT 0.5453)(A 0.7349) for IPC-D-275 Internal Traces

I = 0.0647(DT 0.4281)(A 0.6732) for IPC-D-275 External Traces

The above is the introduction of copper foil thickness in PCB design. Ipcb is also provided to PCB manufacturers and PCB manufacturing technology.