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ECB Passive Backplane PCB for Eurocards DIN41612 4 slot 3U 16HP


I have originally designed this backplane for a few of my projects (Rubidium frequency standard and Z80 Micro Computer), but this turn out so well that I have now posted all schematic, gerber files and documentation to fellow enthusiast such as yourself :) Perhaps (and I hope) content in this obscured corner of interwebs will inspire you to start your own projects.

Eurocard is a European standard format for printed circuit board (PCB) cards that can be plugged together into a standard chassis sub-rack which, in turn, can be mounted in a 19-inch rack. The chassis consists of a series of slotted card guides on the top and bottom, into which the cards are slid so they stand on end, like books on a shelf. At the spine of each card is one or more connectors which plug into mating connectors on a backplane that closes the rear of the chassis.

Eurocards system in general is enormously versatile and convenient way to create any kind of project where high functionality, reliability and ruggedness are required. System uses standardized mechanical dimensions and quality connectors. Eurocards PCB's come in many sizes (wikipedia article). This is single height most common size 3U single height card. I have also designed other 3U passive backplanes if you require different size tailored to your project.

Design of my backplane PCB was inspired by ECB Backplane 4 from RetroBrew Computers Wiki. I definitely recommend going through their webpage!

Design overview

Ideally you will use backplane free standing on table, however design facilitates PCB fit in industry standard 3U subrack, however Z rais is required to install in 3U subrack. Backplane was designed according to standard mechanical values, therefore connectors' mechanical positions will match perfectly with PCB guide rails rails with the front panel Eurorack should you decide to use this solution. Standardized card size is 3U height with 4 slots for 4HP cards (16HP 3U) and will fit into a half width 19" 40TE 3HE standardized subrack. I'm using this with standard 160mm depth cards, but you can use whatever fits in your rack (100,160,240mm).

Main design features:

Backplane PCB has been designed to be very flexible and can be used with large variety of industry standard power and signal connections:
Signal traces - - (passive termination) are not terminated nor have determined pinouts apart from PWR and GND connectors allowing you to configure the backplane to exactly match the requirements of the system. Each pin is bussed across the board, allowing you using row B as GND guard rails thus minimizing crosstalk on rows A and C.
Power connectors - 2x 4pin power (Molex) connector with 5.08mm pitch and/or standard DC barrel jack 5.5mm / 2.1mm center pin positive. Footprint silkscreen on front and back side allowing molex connector to be fitted on both sides, should you decide to fit PCB in the subrack.

Two separate power rails and one single ground plane available. (Vcc, GND, GND, Vdd).
Supply voltages provided via dedicated power connectors facilities: - 4 pin Molex power connector 5.08mm pitch and/or standard DC barrel jack 5.5mm / 2.1mm center pin positive.
DPDT, DPST, SPST Switch footprint alows you to switch VDD and VCC power lines.
Footprint for R and LED power status VCC, VDD on board
Rack Z-mounting holes are NOT electrically connected
Capacitor footprint 7.62mm for the silky smooth DC line and outstanding high-frequency noise suppression
Footprint supports off the shelf standard DIN 41612C 96/64pin Eurocard connectors or 2x32, 64pin PCB edge connectors.
Multiple backplanes can be placed side by side with loss of slot space

Backplane can also be extended with 2 slot bridge connector card to create a daisy chain array of backplanes if required. You can literally make any kind of project and scale it up as much as you wish.

These boards look absolutely gorgeous in standard green solder mask if you go for that standard industrial look. I can advise you where to buy connectors. however you can use any standard off shelf connectors which you can pretty puch purchase anywhere.

Except where otherwise noted, content on this site is licensed under a Creative Commons Attribution 4.0 International license. CC-BY-4.0
I have created content on this website free to use for personal, educational and commercial purposes. If you like or use my work, please mention me or perhaps consider a donation.


... but if you feel like getting something for nothing isn't your cup of tea (completely understandable) (ಥ﹏ಥ) and a prefer to support me and get something back in return, then you can purchase directly on my eBay or Tindie shop. However if you are still up for an adventure */in very positive way/* (and are happy to have PCB's made yourself in your favourite PCB house - PCBWay is highly recommended), then carry on, download gerber files and have fun! ( ͡° ͜ʖ ͡°)

I sell on Tindie

EDA preview

click on pictures to enlarge
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP
3d render v1.21
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP
PCB design layout
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP


Board Type: Backplane
Board Material: FR4-Standard Tg 130-140C Epoxy Glass Composite
Layers: Double sided
PCB Colour: Green colour solder mask, white silk screen lettering
Surface Finish: Lead free HASL-RoHS
External size: 89 x 99 mm
Board Thickness: standard 1.6mm
Pitch: 2.54mm connectors (100.00 mils)
Connector hole matrix: 96 DIN 41612C compatible / PCB edge card connector 2x32 / 64pin compatible
Hole size: 1.00mm
Mounting holes: Standard pitch 3U subrack mount
Board Connector / Footprint: DIN 41612 4 slot x 96pin or 2x32pin 64 / 96 Pin connector, you can also fit 64pin edge connector in. Power connector is via one of the cards or use capacitor (C1-C6 as power connector). Card is double voltage ready. (Vcc, GND, GND, Vdd).
Copper Thickness: 35um
Card weight: 30g

Bill of materials

Identifier Value Qty Notes
Printed Circuit Board 75 x 99 mm 4 slot ECB backplane 1 v1.1
Hardware M2.5 x 10 mm screw 8
Hardware M2.5 nut 8
Connector E1-E4 DIN41612 connector, type C, Vertical, 3 rows 32 pins wide 4 DIN41612_C_3x32_Female_Vertical_THT Documentation (20 MB)
Connector E1-E4 Female DIN 41612 64pin 2x32pin right angle connector 4 2nd alternative use
Connector E1-E4 2x32pin 64pin PCB edge right angle connector 0.1" pitch 4 3rd alternative use
Power Connector J1 TerminalBlock:TerminalBlock_bornier-4_P5.08mm 1 Molex 5.08mm pitch 1x04 pin male connector
Power Connector J2 Connector_BarrelJack:BarrelJack_Horizontal 1 DC Barrel jack 5.5mm
Switch SW1 DPDT, DPST, SPST Switch up to 2x03pin 4.45mm pitch 1
Resistor R1, R2 Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal 2 1k resistors, or calculate forward voltage
Capacitor C1-C6 C_Disc_D3.0mm_W1.6mm_P2.50mm 6 THT
Connector, power C1, C2 PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical 2 Use for or Dual V power input via backplane

Assembly instructions and notes

Gerber files contain " JLCJLCJLCJLC" to the silk layer. You can specify a location of the order number, select the "Specify a location" option when you place an order. Only if you order via JLCPCB
If you will use PCB backplane as rack mount: - install molex connectors, resistors, LED's and pin headers to the back side, otherwise components won't fit due to Z rails.
If you will use PCB backplane as table top or custom mount: - install all components to front side. Use standoffs or rubber feet to electrically isolate from surface.
Use M2.5 screws and nuts to hold DIN connectors in place, these don't need to be fitted to achieve strong mechanical connection however
Use a temperature-controlled soldering station and quality solder. Take care not to leave solder bridges as any short circuit will most likely lead to failures
Use capacitor C1-C2 for silky smooth power lines.
Ground is common for both power rails, E1-E4 DIN connector holes are mechanical and are not connected to ground.


File type File name File size Last modified
PCB schematic for 4 slot backplane v1.0 schematic_backplane4_v10.pdf 383 kB 19/06/2021
PCB schematic for 4 slot backplane v1.21 schematic_backplane4_v121.pdf 385 kB 20/07/2022
PCB schematic for 4 slot backplane v1.21 schematic_backplane4_v121.jpg 613 kB 20/07/2022

Design Files

File type File name File size Last modified
PCB layers v1.1 pcblayers_backplane4_v11.pdf 191 kB 20/01/2022
PCB layers v1.21 pcblayers_backplane4_v121.pdf 216 kB 20/07/2022
Gerbers 75 x 99 mm, 2 Layer FR4, v1.1 168 kB 22/01/2022
Gerbers 89 x 99 mm, 2 Layer FR4, v1.21 207 kB 20/07/2022
Solder paste stencil Not available for this project - -


click on pictures to enlarge
gerber files and photographs may vary, 1.2 pictured
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP
comparison between v1.1 and v1.2
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP
physical size comparison between different backplanes
ECB pssive backplane PCB for Eurocards DIN41612 4 slot 3U 16HP

Versions and revisions

This section lists the project version and revision history.


■ Fixed connector positions and hole size
■ Swapped VDD and VCC connector and switch sides
■ Cosmetic changes


■ Various silkscreen and cosmetic updates
■ Capacitor footprint changed
■ Added switch, molex connector and DC barrel jack.
■ Added LED's


■ Various silkscreen updates
■ Various cosmetic updates
■ Added 45° chamfered corner edges

Last page update: 06 September 2022

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