PCB Manufacturing in DEFINED IMPEDANCE pool

“DEFINED IMPEDANCE pool” is a fast turnaround solution for boards on which a specific impedance for certain tracks is required. The online menus contain a calculator to help you to define the correct values for your layout, for example for 50Ω characteristic and 90Ω differential impedance tracks and spacings, 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 do you get?

  • Clear one page smart menu covering all PCB manufacturing options
  • 4, 6 and 8 layers from 1 piece onwards
  • 100µm – 4mil technology at pooling prices; 0.090 µm – 3 mil non-pooled
  • fully-finished with 2 solder-masks and 1 or 2 silk-screens
  • Many technical options available
  • Three lead-free finishes: electroless gold over nickel or lead-free hot-air levelling pooled; immersion silver non-pooled
  • IS400 – FR-4 – RoHS compliant material optimised for lead-free soldering (see also our blog about materials and leadfree soldering)
  • Standard build-ups (pooled) and many pre-defined non-pooled builds; specials after evaluation
  • No tooling charges
  • No minimum order charge
  • 100% manufacturability check prior to production
  • 100% electrical test on all boards
  • PCB Configurator to check and upload design parameters before pricing
  • PCB Visualizer and PCB Checker analysis before you place your order. (from your order basket)

How to get prices and place orders?

  • Log in and go to Calculate and order/DEFINED IMPEDANCE pool.
  • Select Price calculator to enter all details manually or Analyse your data to get PCB Configurator to analyse your data and enter the design parameters into the Price calculator menu.
  • The menu displays the default values for the service.  If your design conforms to these values, just enter the number of boards and delivery that you need at the top of the page, plus the number of layers and the board size. You see the price requested and some alternative options at once.
  • If you need other options select what you need from the rest of the menu. The smart menus will guide you towards optimum manufacturability and best price.
  • Attach files and place your order in the shopping basket. The PCB Visualizer analysis starts running right away.
  • Open PCB Visualizer to check the results, and if everything is ok, checkout to place your order.

New user?

Not yet signed up to Eurocircuits and our other low-cost online PCB manufacturing services?
You can calculate a price on our public price calculator, but to use the PCB Visualizer analysis and to place orders you need to sign up.

How do we keep “DEFINED IMPEDANCE pool” prices down?

Eurocircuits are specialist in PCB manufacturing of prototype and small batch PCBs. We are experts in order-pooling. Placing different orders on a standard production pooling panel minimizes set-up and production costs so you get good prices and no tooling charges. Because of the large numbers of orders we receive daily, we can offer a large number of technological options in our pooling services. We do a 100% check on your data before manufacture to make sure that you get the boards you want.

DEFINED IMPEDANCE pool service parameters

Number of layers

4, 6, 8

Maximum PCB dimension

500mm x 425mm  for ML

580mm x 425 mm for 0L, 1L and 2L

Minimum dimension

5mm x 5mm for PCB’s

50mm x 50mm for panels

Base material -pooled

Isola IS400 – FR-4 –  Td>=325°C, T260>=60’, T288>=10’, CTEz=<3.5%, Tg=150°C

Base material high Tg – non pooled

Isola 370HR – Td>=340°C, T260>=60’, T288>=30’, CTEz=<2.8%, Tg=180°C

Board thickness

Pooled – 1.00mm (4 layers only)

Pooled – 1.55mm

Non-Pooled – Others available in the online calculator

Base copper foil – Outer layers

Pooled – 18µm/½oz, 35µm/1oz

Non-Pooled – others available in the online calculator

Base copper foil – Inner layers

Pooled – 18µm/½oz, 35µm/1oz

Non-Pooled – others available in the online calculator

Surface finish

Pooled – Lead-free for best price, ENIG, LF HAL

Semi-Pooled – IM Ag

Soldermask type/colour

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

Non-Pooled – Transparent

Extra options

Pooled – Peelable mask, Via Filling, Heatsink paste 

Semi-Pooled – Gold Edge Connectors

Non-Pooled – Carbon pads 

Legend type/colour

Pooled – White on one or both sides

Non-Pooled – Black & White PIL

Min. track width/spacing

Pooled – 0.100mm

Non-Pooled – 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 = finished hole size + listed value

PTH – 0.300mm

NPTH – 0.200mm

Minimum inner layer pad diameter = finished hole size + listed value

 PTH – 0.350mm 

NPTH – 0.250mm

Minimum copper to board-edge clearance – outer layers

 Routed – 0.250mm

V-cut – 0.450mm

Minimum copper to board-edge – 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

Explore all PCB Pooling services from Eurocircuits

PCB proto

1, 2 or 5 PCB’s in 2 or 3 working days


FR-4 lead-free soldering compatible material up to 16 layers


Characteristic and Differential Impedance boards.

RF pool

Isola I-TERA and Rogers 4000 series material


4 layer, 100 micron FR4 core with two specially treated copper layers

IMS pool

Single layer Insulated Metal Substrate PCBs (ALU)

BINDI pool

Medium volume boards from our new plant in India