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.

Below you will also find impedance examples for Rogers / FR4 hybrid layer buildup. Due to the material mix, you have Rogers quality in the high-frequency layers and at the same time a favourable price due to the FR4 core.

Download: Multi-CB Defined layer buildup (4, 6, 8 layers) and layout examples for impedance

Download: Multi-CB Hybrid layer buildup Rogers/FR4 (4 layers) and layout examples for impedance

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 1.6mm (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):

Ohm	Signal layer	Reference layer	width\|space\|width
Single ended	Ohm	50 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	245µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	180µm \| 120µm \| 180µm
Differential pairs	Ohm	100 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	120µm \| 115µm \| 120µm
	Ohm		Signal layer		Reference layer		width\|space\|width
Single ended	Ohm	50 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	245µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	180µm \| 120µm \| 180µm
Differential pairs	Ohm	100 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	120µm \| 115µm \| 120µm

Defined layer buildup 4L-01

4 layer PCB layer buildup impedance 1.6mm

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 4 layers 1.0mm (4L-02)

When using our free Defined layer buildup 4L-02, you will reach the desired impedances e.g. with the following layout parameters (width|space|width):

Ohm	Signal layer	Reference layer	width\|space\|width
Single ended	Ohm	50 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	395µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	230µm \| 120µm \| 230µm
Differential pairs	Ohm	100 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	180µm \| 130µm \| 180µm
	Ohm		Signal layer		Reference layer		width\|space\|width
Single ended	Ohm	50 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	395µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	230µm \| 120µm \| 230µm
Differential pairs	Ohm	100 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	180µm \| 130µm \| 180µm

Defined layer buildup 4L-02

4 layer PCB layer buildup impedance 1.0mm

Estimated final thickness (+/- 10%): 1,0mm
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 6 layers 1.6mm (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):

Ohm	Signal layer	Reference layer	width\|space\|width
Single ended	Ohm	50 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	395µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	230µm \| 120µm \| 230µm
Differential pairs	Ohm	100 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	180µm \| 130µm \| 180µm
	Ohm		Signal layer		Reference layer		width\|space\|width
Single ended	Ohm	50 Ω	Signal layer	IN3	Reference layer	IN2/IN4	width\|space\|width	255µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal layer	IN3	Reference layer	IN2/IN4	width\|space\|width	160µm \| 145µm \| 160µm
Differential pairs	Ohm	100 Ω	Signal layer	IN3	Reference layer	IN2/IN4	width\|space\|width	135µm \| 170µm \| 135µm
	Ohm		Signal layer		Reference layer		width\|space\|width
Single ended	Ohm	50 Ω	Signal layer	IN3	Reference layer	IN2/IN5	width\|space\|width	320µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal layer	IN3	Reference layer	IN2/IN5	width\|space\|width	180µm \| 145µm \| 180µm
Differential pairs	Ohm	100 Ω	Signal layer	IN3	Reference layer	IN2/IN5	width\|space\|width	165µm \| 195µm \| 165µm
	Ohm		Signal layer		Reference layer		width\|space\|width
Single ended	Ohm	50 Ω	Signal layer	IN4	Reference layer	IN5/IN2	width\|space\|width	320µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal layer	IN4	Reference layer	IN5/IN2	width\|space\|width	180µm \| 145µm \| 180µm
Differential pairs	Ohm	100 Ω	Signal layer	IN4	Reference layer	IN5/IN2	width\|space\|width	165µm \| 195µm \| 165µm
	Ohm		Signal layer		Reference layer		width\|space\|width
Single ended	Ohm	50 Ω	Signal layer	IN4	Reference layer	IN5/IN3	width\|space\|width	255µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal layer	IN4	Reference layer	IN5/IN3	width\|space\|width	160µm \| 145µm \| 160µm
Differential pairs	Ohm	100 Ω	Signal layer	IN4	Reference layer	IN5/IN3	width\|space\|width	135µm \| 170µm \| 135µm
	Ohm		Signal layer		Reference layer		width\|space\|width
Single ended	Ohm	50 Ω	Signal layer	BOT	Reference layer	IN5	width\|space\|width	395µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal layer	BOT	Reference layer	IN5	width\|space\|width	230µm \| 120µm \| 230µm
Differential pairs	Ohm	100 Ω	Signal layer	BOT	Reference layer	IN5	width\|space\|width	180µm \| 130µm \| 180µm

Defined layer buildup 6L-01

6 layer PCB layer buildup impedance 1.6mm

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 1.7mm (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):

Ohm	Signal-Lage	Referenz-Lage	width\|space\|width
Single ended	Ohm	50 Ω	Signal-Lage	TOP	Referenz-Lage	IN2	width\|space\|width	245µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal-Lage	TOP	Referenz-Lage	IN2	width\|space\|width	180µm \| 120µm \| 180µm
Differential pairs	Ohm	100 Ω	Signal-Lage	TOP	Referenz-Lage	IN2	width\|space\|width	120µm \| 115µm \| 120µm
	Ohm		Signal-Lage		Referenz-Lage		width\|space\|width
Single ended	Ohm	50 Ω	Signal-Lage	IN3	Referenz-Lage	IN2/IN4	width\|space\|width	175µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal-Lage	IN3	Referenz-Lage	IN2/IN4	width\|space\|width	110µm \| 110µm \| 110µm
	Ohm		Signal-Lage		Referenz-Lage		width\|space\|width
Single ended	Ohm	50 Ω	Signal-Lage	IN3	Referenz-Lage	IN2/IN5	width\|space\|width	210µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal-Lage	IN3	Referenz-Lage	IN2/IN5	width\|space\|width	125µm \| 115µm \| 125µm
	Ohm		Signal-Lage		Referenz-Lage		width\|space\|width
Differential pairs	Ohm	90 Ω	Signal-Lage	IN4	Referenz-Lage	IN3/IN6	width\|space\|width	160µm \| 130µm \| 160µm
Differential pairs	Ohm	100 Ω	Signal-Lage	IN4	Referenz-Lage	IN3/IN6	width\|space\|width	115µm \| 135µm \| 115µm
	Ohm		Signal-Lage		Referenz-Lage		width\|space\|width
Single ended	Ohm	50 Ω	Signal-Lage	IN4	Referenz-Lage	IN3/IN6	width\|space\|width	270µm \| - \| -
Single ended	Ohm	50 Ω	Signal-Lage	IN5	Referenz-Lage	IN3/IN6	width\|space\|width	270µm \| - \| -
	Ohm		Signal-Lage		Referenz-Lage		width\|space\|width
Single ended	Ohm	50 Ω	Signal-Lage	IN6	Referenz-Lage	IN7/IN4	width\|space\|width	210µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal-Lage	IN6	Referenz-Lage	IN7/IN4	width\|space\|width	125µm \| 115µm \| 125µm
	Ohm		Signal-Lage		Referenz-Lage		width\|space\|width
Single ended	Ohm	50 Ω	Signal-Lage	IN6	Referenz-Lage	IN7/IN5	width\|space\|width	175µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal-Lage	IN6	Referenz-Lage	IN7/IN5	width\|space\|width	110µm \| 110µm \| 110µm
	Ohm		Signal-Lage		Referenz-Lage		width\|space\|width
Single ended	Ohm	50 Ω	Signal-Lage	BOT	Referenz-Lage	IN7	width\|space\|width	245µm \| - \| -
Differential pairs	Ohm	90 Ω	Signal-Lage	BOT	Referenz-Lage	IN7	width\|space\|width	180µm \| 120µm \| 180µm
Differential pairs	Ohm	100 Ω	Signal-Lage	BOT	Referenz-Lage	IN7	width\|space\|width	120µm \| 115µm \| 120µm

Defined layer buildup 8L-01

8 layer PCB layer buildup impedance 1.7mm

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

Impedance examples 4 layers hybrid 1.55mm (4L-H01)

Rogers 4350B - 168µm core / FR4

When using our free Defined hybrid layer buildup 4L-H01, you will reach the desired impedances e.g. with the following layout parameters (width|space|width):

Ohm	Signal layer	Reference layer	width\|space\|width
Single ended (SE)	Ohm	50 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	350µm \| - \| -
SE Coplanar	Ohm	50 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	315µm \| gap = 185µm
Differential pairs	Ohm	90 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	315µm \| 265µm \| 315µm
Differential pairs	Ohm	100 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	230µm \| 210µm \| 230µm
	Ohm		Signal layer		Reference layer		width\|space\|width
Single ended (SE)	Ohm	50 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	350µm \| - \| -
SE Coplanar	Ohm	50 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	315µm \| gap = 185µm
Differential pairs	Ohm	90 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	315µm \| 265µm \| 315µm
Differential pairs	Ohm	100 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	230µm \| 210µm \| 230µm

Defined layer buildup 4L-H01 (Rogers 4350B - 168µm core / FR4)

Hybrid layer stackup Rogers FR4 168mm core

Estimated final thickness (+/- 10%): 1.55mm
Prepreg thicknesses after pressing, at approx. 80% copper utilization on the inner layers.
Loss Tangent / Dissipation factor (Df): ca. 0.0037

Impedance examples 4 layers hybrid 1.55mm (4L-H02)

Rogers 4350B - 254µm core / FR4

When using our free Defined hybrid layer buildup 4L-H02, you will reach the desired impedances e.g. with the following layout parameters (width|space|width):

Ohm	Signal layer	Reference layer	width\|space\|width
Single ended (SE)	Ohm	50 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	550µm \| - \| -
SE Coplanar	Ohm	50 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	510µm \| gap = 320µm
Differential pairs	Ohm	90 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	520µm \| 440µm \| 520µm
Differential pairs	Ohm	100 Ω	Signal layer	TOP	Reference layer	IN2	width\|space\|width	410µm \| 370µm \| 410µm
	Ohm		Signal layer		Reference layer		width\|space\|width
Single ended (SE)	Ohm	50 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	550µm \| - \| -
SE Coplanar	Ohm	50 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	510µm \| gap = 320µm
Differential pairs	Ohm	90 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	520µm \| 440µm \| 520µm
Differential pairs	Ohm	100 Ω	Signal layer	BOT	Reference layer	IN3	width\|space\|width	410µm \| 370µm \| 410µm

Defined layer buildup 4L-H02 (Rogers 4350B - 254µm core / FR4)

4 layer hybrid PCB stackup Rogers 4350B - FR4

Estimated final thickness (+/- 10%): 1.55mm
Prepreg thicknesses after pressing, at approx. 80% copper utilization on the inner layers.
Loss Tangent / Dissipation factor (Df): ca. 0.0037

Additional information:

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