DIELECTRIC CONSTANT OF PCB MATERIALS

The following table is to be used as a starting point only for determining impedances using calculators. Dielectric constant will vary depending on such factors as material thickness, number of ply's and resin content. Always consult your board fabricator for feedback on your proposed stack-up and controlled Impedance trace width and space BEFORE layout. Every fabricator has a different process and will modify trace widths to achieve desired impedances. Your board fabricator is a better source than any impedance calculator to determine correct geometries as they are ultimately responsible for delivering verified results..

Fabrication - Assembly

Printed Circuit Design

PC UNIQUE

Links to PC Unique Standards and Reference Materials: