signal integrity

Microstrip Impedance

Computes the key electrical parameters of a PCB microstrip transmission line including characteristic impedance, propagation delay, distributed inductance, capacitance, and DC resistance per unit length.

Inputs

Trace Width(mm)

Width of the PCB trace in millimetres

Trace Thickness(mm)

Thickness of the PCB trace in millimetres

Dielectric Thickness(mm)

Thickness of the dielectric substrate in millimetres

Relative Dielectric Constant

Relative permittivity of the dielectric — FR4: ~4.5, Rogers 4003: ~3.55

Results

⚠Trace width must be greater than zero

Single Ended Impedance—ΩCharacteristic impedance of the microstrip in ohms

Propagation Delay—ps/unit lenPropagation delay per unit length in picoseconds

Inductance—nH/unit lenDistributed inductance per unit length in nanohenries

Capacitance—pF/unit lenDistributed capacitance per unit length in picofarads

Resistance—mΩ/unit lenDC resistance per unit length in milliohms (source labels this pF/unit len — that is a source bug)