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What happens if you use the wrong trace width on a PCB?
If the current-carrying needs of your routing require more copper weight (the thickness of the copper), then your fabricator will not be able to etch small trace widths for you on that same layer. Using the incorrect trace width can have a huge impact on the electrical performance of your PCB.
How to compensate for the PCB trace resistance?
The most effective way to compensate for the PCB trace resistance is to pay for the resistance by increasing the trace area. Design tools can be configured to layout traces with sufficient width to avoid such issues.
How big should a trace width be for low power?
For low power signal traces it is generally advised to keep traces small to increase the available space available for routing. Excessively large traces consume valuable PCB space while offering highly diminished returns. 6 to 30 mils is typical for most signal trace widths.
Why are traces important in a printed circuit board?
PCB trace currents are critical to recognize as they are just as necessary in the construction of a printed circuit board as the trace resistance and trace width. And even more so, if there is no current in any given printed circuit board, there is no power.
How to avoid trace fracturing on flexible circuits?
RA copper should be used for dynamic flexing or for severe folding or bending, as the elongated grain structure of RA copper can withstand more stressing. Copper grain direction is also a key flex life variable. Circuits should be placed on the fabrication panel so the grain direction is perpendicular to the bend line.
How can I avoid using smaller trace widths?
Adding layers to your PCB design to give yourself more routing room is one way to avoid using smaller trace widths. This needs to be carefully considered, however, as it can add cost on the fabrication side as well as introducing signal integrity problems.
What’s the tolerance for a 3 mil trace width?
A 3 mil trace width has much less tolerance for losing metal than a 20 mil trace width would. This over-etch has to be closely controlled by the fabricator when small trace widths are being produced.