ET-C21
CH334F 4-Port USB Hub
USB 2.0 high-speed hub with 4 header ports for inside builds
AED 15.00
Out of stockOverview
USB 2.0 high-speed hub with 4 header ports for inside builds
The ET-C21 is built around the WCH CH334F — USB 2.0 high-speed hub, 4 downstream ports, multi-TT (MTT), 480Mbps.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Several USB devices inside a Pi build
- Kiosks and robots
- Test fixtures
Key features
What makes it different
Hub
WCH CH334F: USB 2.0 high-speed hub, 4 downstream ports, multi-TT (MTT), 480Mbps
Upstream
USB-C (5.1k Rd)
Downstream
4 × 4-pin 0.1" headers (5V, D−, D+, GND) for USB devices inside a project
Power
Bus-powered: total ≤ 900mA (USB 3 port) / 500mA (USB 2 port) shared
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| Hub | WCH CH334F: USB 2.0 high-speed hub, 4 downstream ports, multi-TT (MTT), 480Mbps |
|---|---|
| Upstream | USB-C (5.1k Rd) |
| Downstream | 4 × 4-pin 0.1" headers (5V, D−, D+, GND) for USB devices inside a project |
| Power | Bus-powered: total ≤ 900mA (USB 3 port) / 500mA (USB 2 port) shared |
| Size | 40.0 × 25.0 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 4-pin 2.54 mm header · USB-C 16P receptacle (USB 2.0) — Upstream USB-C |
| Main IC | CH334F (LCSC C5187527) |
| Revision | Rev A |
| Libraries | Driverless on Windows / macOS / Linux |
|---|
Performance
Speed
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VBUS | Power | 5V to device 1 |
| 2 | DM1 | Signal | USB D− |
| 3 | DP1 | Signal | USB D+ |
| 4 | GND | Ground | Ground |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-C21 CH334F 4-Port USB Hub (assembled)
- 1 × 4-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: VBUS, DM1, DP1, GND
- Libraries: Driverless on Windows / macOS / Linux
Compare
Which USB tool?
| CH334F 4-Port USB Hub (this board)This board | ET-C23 CH341A USB-C Flash Programmer | ET-C12 USB-C to I²C / Qwiic Adapter | |
|---|---|---|---|
| What it does | USB 2.0 high-speed hub with 4 header ports for inside builds | Program SPI flash and I²C EEPROM at a true 3.3 V | Talk to Qwiic sensors from a PC — no driver needed |
| Interface | — | — | — |
| Best for | Several USB devices inside a Pi build | BIOS and router flash recovery | Testing sensors from Python |
| Price | 15 AED | 25 AED | 20 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.