2 layers70.5 × 55 mm
USB FINAL
DZ392/pcb-project
This is a small 4-port USB hub built into a butterfly-shaped PCB. Instead of using a cable like most USB hubs, it plugs directly into the side of a laptop.
19 parts
2 layers46.5 × 49.5 mm
Usb hub1
joshitha-c/usb-hubThis project is a compact USB 2.0 hub designed around the SL2.1A USB Hub Controller. It expands a single USB connection into multiple USB ports, making it useful for portable workstations, custom keyboards, and other…
- Size
- 46.5 × 49.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 22
- Pads
- 70
- Tracks, vias
- 213, 33
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 15 Jul 2026
- Updated
- 3 Aug 2026
Overview
Usb hub1 is an open-source printed circuit board by joshitha-c, from the joshitha-c/usb-hub repository on GitHub. It is a 2-layer board of 46.5 × 49.5 mm with 11 parts on 22 nets, routed with 213 tracks and 33 vias.
It is built around the SL2.1A, U-G-O4DD-W-1 and 903-131A1011D10100. Its parts include 3 capacitors, 2 resistors, 1 IC, 1 diode and 1 connector.
Main components
3
SL2.1A
SOP-160℃~+70℃ 120mA 2.5mA 4 4V~5.25V USB 2.0 USB Hub SOP-16 USB HUB Controllers ROHSCoreChipsUSB Converters
U-G-O4DD-W-1
插件1 18.75mm 1A 30V 4P Black Laminated board Male Type-A USB 2.0 插件 USB Connectors ROHSHRO ElectronicsUSB Connectors
903-131A1011D10100
插件-35℃~+85℃ 1 1.5A 13.6mm 30V 4P Female Right Angle Type-A USB 2.0 White 插件 USB Connectors ROHSJing Extension of the Electronic Co.USB Connectors
README
README.mdTravel USB Hub
This project is a compact USB 2.0 hub designed around the SL2.1A USB Hub Controller. It expands a single USB connection into multiple USB ports, making it useful for portable workstations, custom keyboards, and other embedded projects.
The hub was developed as part of a travel-focused hardware project, with the goal of reducing the number of adapters needed when working on the go. It provides a simple way to connect multiple USB devices through a single USB Type-C connection while keeping the hardware compact and easy to integrate.
Features
- USB 2.0 compliant hub
- Based on the SL2.1A USB Hub Controller
- USB Type-C upstream connection
- Multiple downstream USB ports
- Compact PCB suitable for portable devices
- USB-powered operation
- Power filtering for stable performance
- Schottky diode for reverse current protection
- Easy to integrate into custom hardware projects
Travel-Oriented Design
The board was designed with portability in mind.
- Small PCB footprint for compact enclosures
- USB-powered, so no external power supply is required during normal operation
- Supports multiple USB accessories from a single connection
- Suitable for travel workstations and embedded systems
- Simple design for easy assembly and maintenance
The hub is well suited for users who frequently travel with electronics and need a reliable way to connect multiple USB devices without carrying additional adapters.
Hardware Overview
The design is based on the SL2.1A USB Hub Controller, which manages communication between one upstream USB connection and several downstream ports.
Main Components
| Component | Description |
|---|---|
| SL2.1A | USB 2.0 Hub Controller |
| USB Type-C Connector | Upstream connection to the host |
| USB Connectors | Downstream USB ports |
| Schottky Diode | Reverse current protection |
| 10 µF Capacitors | Power supply filtering |
How It Works
The USB Type-C connector provides the upstream connection to the host computer.
Once connected, the SL2.1A hub controller handles communication between the host and each downstream USB device. Power is distributed to the connected peripherals while the filtering capacitors help maintain a stable supply voltage.
A Schottky diode is included to help prevent reverse current and improve power reliability.
Applications
This USB hub can be used in a variety of portable and embedded projects, including:
- Travel workstations
- Portable development kits
- Custom mechanical keyboards
- Raspberry Pi projects
- Embedded systems
- USB expansion for laptops
- DIY electronics projects
Bill of Materials
| Quantity | Component |
|---|---|
| 1 | SL2.1A USB Hub Controller |
| 1 | USB Type-C Connector |
| 3 | USB Connectors |
| 1 | Schottky Diode |
| 3 | 10 µF Capacitors |
| Several | Resistors and other passive components |
Future Improvements
Some ideas for future versions include:
- Individual power indicators for each USB port
- ESD protection on USB data lines
- USB-C Power Delivery support
- Per-port overcurrent protection
- 3D-printed travel enclosure
- Integration with a portable mechanical keyboard
Software Used
- KiCad 10
schematic:
pcb:
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10uF | Capacitor_SMD:CP_Elec_4x5.4 | C2, C4, C5 |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 1 | 670688000 | EasyEDA:USB-B-TH_67068-8000 | USB1 |
| 1 | D_Schottky | Diode_SMD:D_2114_3652Metric | D2 |
| 1 | SL2.1A | EasyEDA:SOP-16_L10.0-W3.9-P1.27-LS6.0-BL | U2 |
| 1 | U-G-04DD-W-01 | EasyEDA:USB-A-TH_U-G-04WD-W-01 | USB5 |
| 1 | USB-AF-90-14.4X13.6-H7.0-DIP | EasyEDA:USB-A-TH_C46407 | USB2 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HCTL_HC-TYPE-C-16P-01A | J1 |
Questions
How big is the Usb hub1 PCB?
It measures 46.5 × 49.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Usb hub1 use?
11 parts, built around the SL2.1A, U-G-O4DD-W-1 and 903-131A1011D10100. 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 Usb hub1 KiCad files?
From the joshitha-c/usb-hub repository on GitHub, at the commit this page was made from: the board is usb hub1.kicad_pcb and its schematic usb hub1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Usb hub1 design in my own project?
Its repository states no licence, so its author keeps all rights: ask joshitha-c before reusing the design.
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