PCB Substrates: Knowing Your Dielectric Material’s Properties

A dielectric material conducts minimal electricity, and provides an insulating layer between two conducting copper layers. The most common dielectric material is FR-4, but before selecting it for your board, you must carefully consider its properties.

Here is an overview of the most important properties to consider for any dielectric material:

Contents hide
1 Thermal properties
2 Electrical properties
3 Chemical properties
3.1 Effects of moisture absorption on dielectric constant (Dk)
3.1.1 Test methodology
4 Mechanical properties

Once you’re ready to choose a material, use the Sierra Circuits Material Selector tool to input criteria and get an easy-to-compare list of dielectrics with the right properties.



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