If you are creating or designing a printed circuit board (PCB), you may be wondering what trace width you should use. PCB trace width is a critical parameter that can affect the performance and reliability of the board. In this blog post, we will compare 10mil, 20mil, and 30mil PCB trace widths and give you the facts you need to make an informed decision.
What is a PCB Trace Width?
A PCB trace width is the width of a conductive metal line on a PCB. The trace width determines the amount of current that can flow through the line and how much resistance the line will have.
PCB Trace Widths
10mil PCB Trace Width
A 10mil PCB trace width is the thinnest trace possible for typical PCB manufacturers. It is commonly used in for low current or high-frequency signals. A 10mil trace width can handle up to 0.5A current with a 10°C temperature rise and has a resistance of 2.8Ω/1000ft.
20mil PCB Trace Width
A 20mil PCB trace width is the most commonly used trace width. It is more robust than a 10mil trace but is still reasonably small. A 20mil trace width can handle up to 1A current with a 10°C temperature rise and has a resistance of 1.4Ω/1000ft.
30mil PCB Trace Width
A 30mil PCB trace width is a thick trace that is used when significant current flows. For example, power traces and ground planes. A 30mil trace width can handle up to 3A current with a 10°C temperature rise and has a resistance of 0.9Ω/1000ft.
Factors to Consider
The decision of what PCB trace width to use depends primarily on the amount of current flowing through the trace. The amount of current affects the amount of heat generated, which can cause the trace to expand, delaminate, or even burn. Other critical factors include the required impedance, frequency, board size, and budget.
Conclusion
PCB trace width is a crucial factor in PCB design that can affect the performance and ultimately, the success of the finished board. While it may seem like a small detail, a single width variation can cause an unexpected issue, making it essential to take the time to consider every aspect of PCB design carefully. If you're still unsure, work with your PCB manufacturer or consult an experienced engineer.