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FPC supplier:What is Trace Width

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Popularity:29Dated :05-11-2022 04:36【big well Small

Let’s start with the basics. What exactly is trace width and why is specifying a particular trace width so important? As the FPC supplier knows that, the point of a FPC trace is to connect any kind of electrical signal, whether it be analog, digital, or power, from one junction to another. The junction can be the pin of a component, a branch off of a larger trace or plane, or an empty pad or test-point intended for probing.

Trace widths are often measured in mils, or thousands of an inch. A standard trace width for an ordinary signal (no special requirements) may be in the 7-12 mil range and be as long as a few inches, but there are many things that should be considered when defining the width and length of a trace. The application will often drive the trace widths and types in a FPC design and at a certain point, there is usually a balance with regards to FPC fabrication cost, board density/size, and performance. If a board has specific design requirements such as speed optimization, noise or coupling mitigation, or high current/voltage, the trace widths and types might be more important than optimizing for manufacturing cost of the bare FPC or overall board size.

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