The minimum width of the printed wire is related to the size of the current flowing through the wire: the line width is too small, the resistance of the just-printed wire is large, the voltage drop on the line is large, affecting the performance of the circuit, the line width is too wide, the wiring density is not high, the board area increases, in addition to increasing the cost, it is not conducive to miniaturization. If the current load is calculated at 20A/ mm2, when the thickness of the copper clad foil is 0.5MM,(generally so much,) the current load of 1MM(about 40MIL) line width is 1A,

　　Therefore, the line width of 1--2.54MM(40--100MIL) can meet the general application requirements, the ground wire and power supply on the high-power equipment board, according to the power size, can be appropriately increased line width, and in the low-power digital circuit, in order to improve the wiring density, the minimum line width of 0.254--1.27MM(10--15MIL) can be full Full. Same circuit board, power cord. Ground cables are thicker than signal cables.

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