Bare Board or Assembled PCB’s up to 8 Layers

Made in Europe

Eurocircuits’ PCB DEFINED IMPEDANCE pool is a fast turnaround solution for PCB’s with a specific impedance requirements for certain tracks.

The online menus contain a calculator to help you to define the correct track and gap values for your layout, for example for 50Ω characteristic and 90Ω differential impedance using material with a guaranteed dielectric constant (εr).

A single clear smart menu structure gives you immediate access to Eurocircuits’ wide range of pooling and non-pooling options. The menu will flag non-poolable items, so that you can change them for lower cost pooling options where possible.

Pooling prices are based on panel-sharing. Non-pooling prices are based on a production panel specific to the option and the job.

Boards can be supplied as single circuits or panels.

The standard price matrix shows alternative (lower-cost) quantities and deliveries, or set your own custom matrix. If your requirements are not covered, use Place inquiry to send your data to our engineers for evaluation.

What’s Available

  • Bare Board or Assembled PCB’s
  • Bare Board PCB’s in 5 Working Days* or Assembled PCB’s in 10 Working Days*
  • 4, 6 and 8 Layers from 1 Piece Onwards
  • 100µm Track & Gap pooling – 90 µm Non-pooling
  • 2 Soldermasks and 1 or 2 Legends/Silkscreens
  • Lead-free Finishes: Electroless Gold over Nickel or Lead-free HAL pooling – Immersion Silver Non-pooling
  • IS400 – FR-4 – RoHS Compliant Material Optimised for Lead-free Soldering (see also our blog about materials and lead-free soldering)
  • Standard Buildups (pooling) or Predefined Non-pooling Builds Available (Specials after evaluation)
  • Smart Menu Covering all PCB Manufacturing Options
  • Wide Range of Options Available
  • No Tooling Charges
  • No Minimum Order Charge.
  • 100% Manufacturability Check Prior to Production
  • 100% Electrical Test
  • PCB Configurator to check and upload design parameters before pricing
  • PCB Checker to analyses your data before you place your order
  • BOM and CPL analysis

Defined Impedance Track Layout Drawing

Free Online Price Button

DEFINED IMPEDANCE pool Service Parameters

Number of Layers

4, 6 or 8 

Non-Pooling – Others available in the online calculator

Maximum PCB Dimension

500mm x 425mm  for ML

Minimum Dimension

5mm x 5mm for PCB’s

50mm x 50mm for panels

Base Material (pooled)

Isola IS400

Base Material High Tg (Non pooled)

Isola 370HR

Board Thickness

Pooling – 1.00mm (4 layers only)

Pooling – 1.55mm

Non-Pooling – Others available in the online calculator

Base Copper Foil – Outer Layers

Pooling – 18µm, 35µm

Non-Pooling – others available in the online calculator

Base Copper Foil – Inner Layers

Pooling – 18µm, 35µm

Non-Pooling – others available in the online calculator

Surface Finish

Pooling – Lead-free for best price, ENIG, LF HAL, IM Ag

Soldermask Type/Colour

Pooling – Green, Blue, Black, White, Red, PixtureBlackWhite

Non-Pooling – Transparent

Extra Options

Pooling – Peelable Mask, Via Filling, Heatsink Paste, Gold Edge Connectors

Non-Pooling – Carbon Pads

Legend Type/Colour

Pooling – White on one or both sides

Non-Pooling – Black & White PIL

Min. Track Width/Spacing

Pooling – 0.100mm

Non-Pooling – 0.090mm

Min. Finished Hole Size

PTH – 0.100mm

NPTH – 0.200mm

Non-Pooled – others available in the online calculator

Minimum Outer Layer Pad Diameter

PTH is Finished Hole Size + 0.300mm

NPTH is Finished Hole Size + 0.200mm

Minimum Inner Layer Pad Diameter

PTH is Finished Hole Size + 0.350mm

NPTH is Finished Hole Size + 0.250mm

Minimum Copper to Board-edge Clearance – Outer Layers

Routed – 0.250mm

V-cut – 0.450mm

Minimum Copper to Board-edge Clearance – Inner Layers

Routed – 0.400mm

V-cut – 0.450mm

Extra Copper Features

Copper up to Edge

Plated Holes on Edge

Round-edge Plating

Slots and Cut-outs

Tool Sizes – 0.5, 1.2, & 2.0mm

Delivery Panels

Break-routed with 2 mm Tool or V-cut

Maximum Customer Panel that can be eC-compatible

350 x 250mm

Minimum Customer Panel that can be eC-comaptible

50 x 50 mm


Pooled; eC-predefined buildups: 2 for 4L and 1 for all others

Non-pooled; eC-predefined buildups with possibilities to include blind and buried vias

Use our online buildup editor which includes +/-800 eC-predefined buildups

Electrical Test


UL marking


Stencil Material

100µm and 130µm Stainless Steel

Maximum Stencil Size

595 x 595 mm

The DEFINED IMPEDANCE pool calculator starts with Default Settings, as described in this article

DEFINED IMPEDANCE pool Assembly Service Parameters

Number of Component Layers

1 or 2


1 PCB and up

Lead Time

10 working days* (5 for manufacture and 5 for assembly)

Minimum PCB Dimensions

5mm x 5mm

Maximum Customer Panel

326mm x 426mm

Assembly Type

SMT – single or double sided

THT – single or double sided

SMT + THT Mixed Technology – single or double sided


Passive Components  – 0201 and higher

Active Components – from 0,35mm pitch

BGA – 0,4mm pitch and above

Solder Alloy

Basis SAC 305 Sn 96,5 Ag3 Cu 0,5 lead-free

Solder Paste Stencil

Laser cut

(included in the assembly cost – not delivered with the assembled boards)

Component Sourcing

All Components Sourced by Eurocircuits

(Components not sourceable by Eurocircuits can be supplied by the customer)

Quality Inspection

Visual inspection

Solder Paste Inspection (SPI)

BGA Placement

X-ray Inspection


  1. Subject to design meeting our DEFINED IMPEDANCE pool manufacturing and assembly specification and component availability.
  2. The price cannot be automatically calculated for a PCB containing more than 200 BOM lines or 1000 component placements, our engineering department will evaluate and send you an offer usually within 24 hours.
  3. These conditions are available in our calculator/Visualizer and will only be confirmed in our order confirmation.