Layout examples for impedance

Printed Circuit Board impedance examples

With our cost-free defined layer buildups and the following layout examples for impedances, you can approximately achieve your desired values for impedances.

All values given are average values based on our many years of experience and serve as a basic orientation. The actual values depend on the individual PCB layout and the chosen manufacturing technology.

On request, we can manufacture your PCB with impedance control (+/- 10% bzw. +/- 5%) and custom layer buildup. For assistance, we provide our impedance calculator.

Impedance examples 4 layers (4L-01)

When using our free Defined layer buildup 4L-01, you will reach the desired impedances e.g. with the following layout parameters (width|space|width):

 OhmSignal layerReference layerwidth|space|width
 Single endedOhm50 ΩSignal layerTOPReference layerIN2width|space|width231µm | - | -
 Differential pairsOhm90 ΩSignal layerTOPReference layerIN2width|space|width158µm | 106µm | 158µm
 Differential pairsOhm100 ΩSignal layerTOPReference layerIN2width|space|width122µm | 114µm | 122µm
  Ohm Signal layer Reference layer width|space|width 
 Single endedOhm50 ΩSignal layerBOTReference layerIN3width|space|width231µm | - | -
 Differential pairsOhm90 ΩSignal layerBOTReference layerIN3width|space|width158µm | 106µm | 158µm
 Differential pairsOhm100 ΩSignal layerBOTReference layerIN3width|space|width122µm | 114µm | 122µm

Defined layer buildup 4L-01

4 layer PCB layer buildup impedance
  • Estimated final thickness (+/- 10%): 1,6mm
  • Prepreg thicknesses after pressing, at approx. 80% copper utilization on the inner layers.
  • Loss Tangent / Dissipation factor (Df): ca. 0,02
  • Dielectric constant Ԑr for 1x Prepreg 1080: 3,95 

Impedance examples 6 layers (6L-01)

When using our free Defined layer buildup 6L-01, you will reach the desired impedances e.g. with the following layout parameters (width|space|width):

 OhmSignal layerReference layerwidth|space|width
 Single endedOhm50 ΩSignal layerTOPReference layerIN2width|space|width395µm | - | -
 Differential pairsOhm90 ΩSignal layerTOPReference layerIN2width|space|width230µm | 121µm | 230µm
 Differential pairsOhm100 ΩSignal layerTOPReference layerIN2width|space|width180µm | 130µm | 180µm
  Ohm Signal layer Reference layer width|space|width 
 Single endedOhm50 ΩSignal layerIN3Reference layerIN2/IN4width|space|width254µm | - | -
 Differential pairsOhm90 ΩSignal layerIN3Reference layerIN2/IN4width|space|width163µm | 143µm | 163µm
 Differential pairsOhm100 ΩSignal layerIN3Reference layerIN2/IN4width|space|width137µm | 168µm | 137µm
  Ohm Signal layer Reference layer width|space|width 
 Single endedOhm50 ΩSignal layerIN3Reference layerIN2/IN5width|space|width320µm | - | -
 Differential pairsOhm90 ΩSignal layerIN3Reference layerIN2/IN5width|space|width182µm | 147µm | 182µm
 Differential pairsOhm100 ΩSignal layerIN3Reference layerIN2/IN5width|space|width165µm | 195µm | 165µm
  Ohm Signal layer Reference layer width|space|width 
 Single endedOhm50 ΩSignal layerIN4Reference layerIN5/IN2width|space|width320µm | - | -
 Differential pairsOhm90 ΩSignal layerIN4Reference layerIN5/IN2width|space|width182µm | 147µm | 182µm
 Differential pairsOhm100 ΩSignal layerIN4Reference layerIN5/IN2width|space|width165µm | 195µm | 165µm
  Ohm Signal layer Reference layer width|space|width 
 Single endedOhm50 ΩSignal layerIN4Reference layerIN5/IN3width|space|width254µm | - | -
 Differential pairsOhm90 ΩSignal layerIN4Reference layerIN5/IN3width|space|width163µm | 143µm | 163µm
 Differential pairsOhm100 ΩSignal layerIN4Reference layerIN5/IN3width|space|width137µm | 168µm | 137µm
  Ohm Signal layer Reference layer width|space|width 
 Single endedOhm50 ΩSignal layerBOTReference layerIN5width|space|width395µm | - | -
 Differential pairsOhm90 ΩSignal layerBOTReference layerIN5width|space|width230µm | 121µm | 230µm
 Differential pairsOhm100 ΩSignal layerBOTReference layerIN5width|space|width180µm | 130µm | 180µm

Defined layer buildup 6L-01

6 layer PCB layer buildup impedance
  • Estimated final thickness (+/- 10%): 1,6mm
  • Prepreg thicknesses after pressing, at approx. 80% copper utilization on the inner layers.
  • Loss Tangent / Dissipation factor (Df): ca. 0,02
  • Dielectric constant Ԑr for 1x Prepreg 2116: 4,20 

Impedance examples 8 layers (8L-01)

When using our free Defined layer buildup 8L-01, you will reach the desired impedances e.g. with the following layout parameters (width|space|width):

 OhmSignal-LageReferenz-Lagewidth|space|width
 Single endedOhm50 ΩSignal-LageTOPReferenz-LageIN2width|space|width231µm | - | -
 Differential pairsOhm90 ΩSignal-LageTOPReferenz-LageIN2width|space|width158µm | 106µm | 158µm
 Differential pairsOhm100 ΩSignal-LageTOPReferenz-LageIN2width|space|width122µm | 114µm | 122µm
  Ohm Signal-Lage Referenz-Lage width|space|width 
 Single endedOhm50 ΩSignal-LageIN3Referenz-LageIN2/IN4width|space|width175µm | - | -
 Differential pairsOhm90 ΩSignal-LageIN3Referenz-LageIN2/IN4width|space|width112µm | 111µm | 112µm
  Ohm Signal-Lage Referenz-Lage width|space|width 
 Single endedOhm50 ΩSignal-LageIN3Referenz-LageIN2/IN5width|space|width211µm | - | -
 Differential pairsOhm90 ΩSignal-LageIN3Referenz-LageIN2/IN5width|space|width125µm | 116µm | 125µm
  Ohm Signal-Lage Referenz-Lage width|space|width 
 Single endedOhm50 ΩSignal-LageIN6Referenz-LageIN7/IN4width|space|width211µm | - | -
 Differential pairsOhm90 ΩSignal-LageIN6Referenz-LageIN7/IN4width|space|width125µm | 116µm | 125µm
  Ohm Signal-Lage Referenz-Lage width|space|width 
 Single endedOhm50 ΩSignal-LageIN6Referenz-LageIN7/IN5width|space|width175µm | - | -
 Differential pairsOhm90 ΩSignal-LageIN6Referenz-LageIN7/IN5width|space|width112µm | 111µm | 112µm
  Ohm Signal-Lage Referenz-Lage width|space|width 
 Single endedOhm50 ΩSignal-LageBOTReferenz-LageIN7width|space|width231µm | - | -
 Differential pairsOhm90 ΩSignal-LageBOTReferenz-LageIN7width|space|width158µm | 106µm | 158µm
 Differential pairsOhm100 ΩSignal-LageBOTReferenz-LageIN7width|space|width122µm | 114µm | 122µm

Defined layer buildup 8L-01

8 layer PCB layer buildup impedance
  • Estimated final thickness (+/- 10%): 1,7mm
  • Prepreg thicknesses after pressing, at approx. 80% copper utilization on the inner layers.
  • Loss Tangent / Dissipation factor (Df): ca. 0,02
  • Dielectric constant Ԑr for 1x Prepreg 2116: 4,20
  • Dielectric constant Ԑr for 1x Prepreg 1080: 3,95