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4 layers50 × 21.4 mmEthernet, the printed circuit board in 3D

Ethernet

sneakylizard123-4/Ethernet_module

A small SPI Ethernet breakout for the W5500.

Full screenGitHub.kicad_pcb
Size
50 × 21.4 mm
Copper layers
4
Thickness
1.6 mm
Parts
35
Nets
50
Pads
144
Tracks, vias
265, 41
Pours
4
Routed
Yes
KiCad
KiCad 10.0 (file 20260206)
Created
25 Sep 2026
Updated
23 Oct 2026

Overview

Ethernet is an open-source printed circuit board by sneakylizard123-4, from the sneakylizard123-4/Ethernet_module repository on GitHub. It is a 4-layer board of 50 × 21.4 mm with 35 parts on 50 nets, routed with 265 tracks and 41 vias.

It is built around the W5500 and HH-1M1608-121JT. Its parts include 17 capacitors, 10 resistors, 2 diodes, 2 connectors and 1 IC. It belongs with the interfaces and adapters boards of this library.

Main components

2

README

README.md

W5500 Ethernet Module

A small SPI Ethernet breakout for the W5500.

Assembled 3D render

Features

  • SPI interface
  • 10/100 Ethernet
  • 4-layer board with ground and 3.3V planes
  • Split analog/digital supply with ferrite bead
  • On-board and jack LEDs
  • 25 MHz crystal

PCB

50.0 x 21.4 mm, 4-layer, 1.6 mm FR-4.

PCB top copper

Schematic

Root Power RJ45 Connector W5500

Pinout

PinNameNotes
1GNDGround
23.3VPower in
3SCSChip select (active low)
4SCLKSPI clock
5MISOSPI MISO
6MOSISPI MOSI
7INTInterrupt (active low)
8RSTReset (active low)

BOM

RefValueMPNManufacturerQtyUnit $Ext $Supplier Link
C1,C4,C6,C8,C10,C11,C130.1uF 50V X7R 0603CL10B104KB8NNNCSamsung Electro-Mechanics70.00880.0616LCSC
C9,C1218pF 50V C0G 06030603N180J500CTUnion Semiconductor20.00690.0138LCSC
C5,C1410nF 50V X7R 0603CL10B103KB8NNNCSamsung Electro-Mechanics20.01030.0206LCSC
C15,C176.8nF 50V X7R 0603CL10B682JB8NNNCSamsung Electro-Mechanics20.00750.0150LCSC
C1622nF 50V X7R 0603CC0603KRX7R9BB223Yageo10.00630.0063LCSC
C2,C310uF 10V X5R 0603CL10A106KP8NNNCSamsung Electro-Mechanics20.03220.0644LCSC
C74.7uF 10V X5R 0603CL10A475KP8NNNCSamsung Electro-Mechanics10.01640.0164LCSC
D1,D2LED red high-efficiency 0603KT-0603RKeystone Electronics20.00760.0152LCSC
FB1Ferrite bead 120R 0603CBW160808U121TSunlord10.00860.0086LCSC
J1RJ45 magjack HFJ11-2450E-L11RLHFJ11-2450E-L11RLHalo Electronics15.23005.2300DigiKey
J2Header 1x08 2.54mm2.54-1*8CONNFLY Elec10.04420.0442LCSC
R112.4k 1% 06030603WAF1242T5EUniRoyal Elec10.00150.0015LCSC
R2,R31k 1% 06030603WAF1001T5EUniRoyal Elec20.00260.0052LCSC
R4,R5,R6,R749.9R 1% 0603RC0603FR-0749R9LYageo40.00620.0248LCSC
R810R 1% 06030603WAF100JT5EUniRoyal Elec10.00320.0032LCSC
R9,R10330R 1% 06030603WAF3300T5EUniRoyal Elec20.00260.0052LCSC
RN10R array 0603x44D03WGJ0000T5EUniRoyal Elec10.00900.0090LCSC
U1W5500 LQFP-48W5500WIZnet12.85032.8503LCSC
X125MHz 3225TXC-7A-25.000MBB-TTXC Corporation10.09540.0954LCSC
PCB50.0x21.4mm 4-layer FR-4 (5 pcs, est.)-JLCPCB52.000010.0000JLCPCB
Total (parts per 1 board)8.49
Grand total (5 boards: parts + PCBs)52.45

Full BOM: BOM.csv

Production

Gerbers, drill files, STEP, IPC netlists, and placement files are in kicad/production/.

Known issues

  • The RJ45 mating face is ~6.1 mm closer to the board center than Halo recommends. Check case clearances.
  • No mounting holes.

License

Hardware: CERN-OHL-S-2.0. This covers the board design and the reconstructed 3D model for the magjack.

Based on WIZnet's W5500 reference design.

Parts

35
QtyValueFootprintReferences
70.1uFCapacitor_SMD:C_0603_1608MetricC1, C4, C6, C8, C10, C11, C13
449.9 1%Resistor_SMD:R_0603_1608MetricR4, R5, R6, R7
210nFCapacitor_SMD:C_0603_1608MetricC5, C14
210uFCapacitor_SMD:C_0603_1608MetricC2, C3
218pFCapacitor_SMD:C_0603_1608MetricC9, C12
21kResistor_SMD:R_0603_1608MetricR2, R3
2330Resistor_SMD:R_0603_1608MetricR9, R10
26.8nFCapacitor_SMD:C_0603_1608MetricC15, C17
2LEDLED_SMD:LED_0603_1608MetricD1, D2
10Resistor_SMD_AKL:R_Array_Convex_4x0603RN1
110R 1%Resistor_SMD:R_0603_1608MetricR8
112.4k 1%Resistor_SMD:R_0603_1608MetricR1
122nFCapacitor_SMD:C_0603_1608MetricC16
125MHzCrystal_AKL:Crystal_SMD_3225-4Pin_3.2x2.5mmX1
14.7uFCapacitor_SMD:C_0603_1608MetricC7
1Conn_01x08Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_VerticalJ2
1HH-1M1608-121JTFuse:Fuse_0603_1608MetricFB1
1RJ45_Halo_HFJ11-x2450E-LxxRLConnector_RJ:RJ45_HALO_HFJ11-x2450E-LxxRL_HorizontalJ1
1W5500Package_QFP:LQFP-48_7x7mm_P0.5mmU1

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Questions

How big is the Ethernet PCB?

It measures 50 × 21.4 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Ethernet use?

35 parts, built around the W5500 and HH-1M1608-121JT. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Ethernet KiCad files?

From the sneakylizard123-4/Ethernet_module repository on GitHub, at the commit this page was made from: the board is kicad/Ethernet.kicad_pcb and its schematic kicad/Ethernet.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Ethernet design in my own project?

Its repository states no licence, so its author keeps all rights: ask sneakylizard123-4 before reusing the design.