2 layers45.5 × 42.9 mm
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21 parts915
4 layers81.9 × 35.3 mm
USB3 ethernet
AyushShuklaaa7/USB3_Ethernet_InterfaceHigh-speed USB 3.1 Gen 1 to Gigabit Ethernet interface PCB designed in KiCad using the Microchip LAN7801 and KSZ9031RNX.
- Size
- 81.9 × 35.3 mm
- Copper layers
- 4
- Thickness
- 1.59 mm
- Parts
- 81
- Nets
- 87
- Pads
- 345
- Tracks, vias
- 892, 155
- Pours
- 25
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 2 Aug 2026
- Updated
- 2 Aug 2026
Overview
USB3 ethernet is an open-source printed circuit board by AyushShuklaaa7, from the AyushShuklaaa7/USB3_Ethernet_Interface repository on GitHub, published under the MIT licence. It is a 4-layer board of 81.9 × 35.3 mm with 81 parts on 87 nets, routed with 892 tracks and 155 vias.
It is built around the KSZ9031RNXCA, TLV1117LV33DCYT and ABM8G-25.000MHZ-B4Y-T, with the DMG2301L among its other parts. Its parts include 34 capacitors, 30 resistors, 4 ICs, 1 diode and 1 transistor. It belongs with the interfaces and adapters boards of this library.
Main components
4
KSZ9031RNXCA
QFN-48-EP(7x7)0℃~+70℃ 1.2V、1.8V、2.5V、3.3V 10BASE-T、100BASE-TX、1000BASE-T 10Mbit/s、100Mbit/s、1Gbit/s 4 PHY Transceiver RGMII QFN-48-EP(7x7) Ethernet Transceivers ROHSMicrochip TechnologyEthernet Transceivers
TLV1117LV33DCYT
SOT-223-4-40℃~+125℃@(Tj) 1 100uA 1A 3.3V 455mV@(1A) 5.5V 60uVrms 65dB@(1kHz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown、Input under-voltage protection Positive SOT-223-4 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
ABM8G-25.000MHZ-B4Y-T
SMD3225-4P-20℃~+70℃ 10pF 25MHz 60Ω ±30ppm ±30ppm SMD3225-4P Crystals ROHSAbraconCrystals
DMG2301L
SOT-23-55℃~+150℃ 1 P-Channel 1.2V 1.5W 150mΩ@2.5V 20V 3A 5.5nC@4.5V P-Channel SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETs
README
README.mdUSB 3.1 Gen 1 to Gigabit Ethernet Interface
This project is a hardware implementation of a USB 3.1 Gen 1 to Gigabit Ethernet adapter designed in KiCad. It is based on the Microchip LAN7801 USB-to-Ethernet controller and the KSZ9031RNX Gigabit Ethernet PHY.
The goal of this project was to gain practical experience in designing a high-speed PCB while following signal integrity, power integrity, and layout guidelines required for USB 3.1 and Gigabit Ethernet interfaces.
Overview
The LAN7801 acts as the USB 3.1 Gen 1 bridge and Ethernet MAC, converting 5 Gbps USB SuperSpeed data into a 125 MHz RGMII interface. The KSZ9031RNX then converts the RGMII data into standard Gigabit Ethernet signals that are transmitted through the RJ45 MagJack.
The design uses dedicated 3.3V and 1.2V power rails. Instead of using an external 1.2V regulator, the KSZ9031RNX's integrated LDO controller is used with a DMG2301L P-channel MOSFET to generate the PHY core supply, reducing the overall component count.
A 25 MHz ABM8G crystal provides the reference clock for both devices.
PCB Layout
Top Layer
Bottom Layer
3D View
Hardware Block Diagram
The USB Type-A connector interfaces with the LAN7801 controller. The controller communicates with the KSZ9031RNX Gigabit PHY over the RGMII interface, while MDIO/MDC is used for PHY configuration. The PHY then drives the RJ45 MagJack to provide a standard Gigabit Ethernet connection.
Design Approach
The project started by studying the LAN7801 and KSZ9031RNX datasheets along with the manufacturer's reference designs to understand the required interfaces, power supplies, clocking, and layout recommendations.
After completing the schematic, component placement was planned carefully to keep high-speed signal paths as short as possible. The USB controller was placed close to the USB connector, while the Ethernet PHY was positioned near the RJ45 MagJack to minimize RGMII routing.
During PCB layout, the main focus was maintaining signal integrity by following controlled impedance routing, differential pair routing, length matching, proper grounding, and good decoupling practices.
Main Components
| Component | Description |
|---|---|
| LAN7801 | USB 3.1 Gen 1 to Gigabit Ethernet Controller |
| KSZ9031RNX | Gigabit Ethernet PHY |
| ABM8G | 25 MHz Crystal Oscillator |
| DMG2301L | P-Channel MOSFET |
| RJ45 MagJack | Gigabit Ethernet Connector |
| USB Type-A Connector | USB SuperSpeed Interface |
PCB Design Highlights
- 4-layer PCB stack-up
- USB 3.1 SuperSpeed differential pair routing
- 125 MHz RGMII interface routing
- Controlled impedance traces
- Differential pair length matching
- Continuous ground plane
- Proper decoupling capacitor placement
- ESD protection for external interfaces
- Power integrity considerations
Design Challenges
Some of the key challenges while designing this PCB were:
- Routing USB SuperSpeed differential pairs while maintaining impedance.
- Length matching the RGMII interface.
- Placing decoupling capacitors close to the IC power pins.
- Maintaining clean return current paths using continuous ground planes.
- Planning the component placement to minimize high-speed routing complexity.
- Following the layout recommendations provided in the component datasheets.
Software Used
- KiCad
- Saturn PCB Toolkit
- Pspice
Future Improvements
- Generate complete fabrication outputs (Gerber, Drill, BOM and Pick & Place files).
- Perform impedance verification using PCB stack-up calculations.
- Prototype and validate the hardware with functional testing.
- Perform USB and Ethernet compliance testing.
Author
Ayush Shukla
B.Tech Electronics & Telecommunication Engineering
Parts
81| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C7, C8, C13, C16, C17, C19, C21, C24, C25, C27, C28, C29, C31, C32, C33, C34 |
| 8 | 4.7K | Resistor_SMD:R_0402_1005Metric | R2, R3, R5, R6, R7, R8, R9, R10 |
| 7 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C4, C5, C18, C30 |
| 7 | 22R | Resistor_SMD:R_0402_1005Metric | R30, R31, R32, R33, R34, R35, R37 |
| 6 | 10K | Resistor_SMD:R_0402_1005Metric | R1, R23, R25, R26, R38, R40 |
| 4 | 1uF | Capacitor_SMD:C_0402_1005Metric | C11, C22, C23, C26 |
| 2 | 12K | Resistor_SMD:R_0402_1005Metric | R4, R28 |
| 2 | 15pF | Capacitor_SMD:C_0402_1005Metric | C14, C15 |
| 2 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2 |
| 1 | 0.1uF | Resistor_SMD:R_0402_1005Metric | R29 |
| 1 | 0483930003 | Connector_USB:USB3_A_Molex_48393-001 | USB_A |
| 1 | 0R | Resistor_SMD:R_0402_1005Metric | R39 |
| 1 | 100K | Resistor_SMD:R_0402_1005Metric | R22 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R27 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | 10uF | Capacitor_SMD:C_0402_1005Metric | C12 |
| 1 | 1K | Resistor_SMD:R_0402_1005Metric | R36 |
| 1 | 220R | Inductor_SMD:L_0805_2012Metric | FB1 |
| 1 | 22uF | Capacitor_SMD:C_0402_1005Metric | C9 |
| 1 | 2K | Capacitor_SMD:C_0402_1005Metric | C20 |
| 1 | 3.3uH | ME3220-102MLB:IND_ME3220-102MLB | L1 |
| 1 | 330k | Resistor_SMD:R_0402_1005Metric | R21 |
| 1 | 4.7uF | Capacitor_SMD:C_0402_1005Metric | C10 |
| 1 | 75R | Resistor_SMD:R_0402_1005Metric | R11 |
| 1 | 93AAxxC | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U7 |
| 1 | ABM8G-25.000MHZ-B4Y-T | Crystal:Crystal_SMD_Abracon_ABM8G-4Pin_3.2x2.5mm | Y1 |
| 1 | DMG2301L | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | ESD8008MUTAG | ESD8008MUTAG:DIO_ESD8008MUTAG | D1 |
| 1 | FerriteBead | Inductor_SMD:L_0805_2012Metric | FB2 |
| 1 | KSZ9031RNXCA | Package_DFN_QFN:QFN-48-1EP_7x7mm_P0.5mm_EP5.15x5.15mm | U1 |
| 1 | LAN7801-I_9JX | LAN7801-I_9JX:QFN50P900X900X100-65N_LAN7801-I_9JX | U8 |
| 1 | LOGO | N_logo:sh_sh | G*** |
| 1 | Polyfuse | Fuse:Fuse_0805_2012Metric | F2 |
| 1 | TLV1117LV33DCYT | TLV1117LV33DCYT:SOT230P700X180-4N | U2 |
| 1 | WE-RJ45_7499111446 | Connector_RJ:RJ45_Wuerth_7499111446_Horizontal | ETHERNET |
The 80 most common of 81 parts.
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Questions
How big is the USB3 ethernet PCB?
It measures 81.9 × 35.3 mm and has 4 copper layers, 1.59 mm thick.
What parts does the USB3 ethernet use?
81 parts, built around the KSZ9031RNXCA, TLV1117LV33DCYT, ABM8G-25.000MHZ-B4Y-T and DMG2301L. 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 USB3 ethernet KiCad files?
From the AyushShuklaaa7/USB3_Ethernet_Interface repository on GitHub, at the commit this page was made from: the board is USB3_ethernet.kicad_pcb and its schematic POWER.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the USB3 ethernet design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).