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The characteristic impedance (Zo) of a paired strips can be calculated with the active calculator.

[diagram of PCB layers]

Relative Dielectric Constant

εr :

Width of track

W : mm

Thickness of dielectric

h : mm



Formula by
Brian C. Wadell

Characteristic Impedance

Zo : Ohms

Propagation Delay

Tp : ns/mm

Propagation Speed

Vp : mm/ns

Error in formula

Err :