Right Trace Width for PCB Design
When designing single layer or multilayer PCB boards, trace width is an important factor to be considered. Requirements for good trace width can influence PCB size and layout. An effective trace width can ensure that the trace, whether for signal or power, is operating effectively and providing optimal PCB function.
Standard practices about PCB trace width are as follows:
Width- Typically, trace width used to carry signal can be smaller than the trace used to carry current. For an optimized trace, a good width range can be from 0.010” for 0.3 amps to 0.150" for 6.0 amps.
Shape- A trace can be arranged on a PCB layer in the horizontal or vertical direction or at an angle of 45 degrees. For traces of 0.012"or less, it is not recommended to use right or acute angle. Keep traces as short and direct as possible. If you use traces along the edges of the layer, make sure enough space between traces and edges of the layer, usually 10 to 15 mils.
Spacing- Traces too close to each other or to other components may cause potential short circuits on PCB board during operation. 0.003" is the common minimum spacing between traces; the recommended spacing for most trace widths should be at least 0.010". Spacing for higher voltage traces should be larger.