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:
||height of trace or dielectric above return plane
||distance between the differential stripline pair
||relative permittivity of the dielectric
Electrical Parameter Definitions:
||effective characteristic impedance including the capacitance of distributed loads
||inductance per unit length
||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.