PCB Trace Impedance Calculator
Calculates the characteristic impedance and per-unit-length parameters
of typical printed circuit board trace geometries.
Select a configuration:
Embedded Microstrip Trace
Dual Stripline Trace
|Geometric Parameter Definitions:|
|W:|| ||trace width|
|H (/H1)||height of trace or dielectric above return plane|
|C:||distance between the differential stripline pair|
|er:||relative permittivity of the dielectric|
Electrical Parameter Definitions:
|Zo:|| ||characteristic impedance|
|Zc:||effective characteristic impedance including the capacitance of distributed loads|
|Lo:||inductance per unit length|
|Co:||capacitance per unit length|
The source for formulas used in this calculator (except where otherwise noted) is the Design Guide for Electronic Packaging Utilizing High-Speed Techniques (4th Working Draft, IPC-2251, February 2001.
THESE FORMULAS ARE APPROXIMATIONS! They should not be used when a high degree of accuracy is required.
This transmission line calculator was based on a concept developed by Douglas Brooks of UltraCAD Design, Inc.