ET-C03
USB-C to UART Adapter
CH340C serial adapter with 3.3 V logic
AED 27.00
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Overview
CH340C serial adapter with 3.3 V logic
The ET-C03 is built around the WCH CH340C — USB 2.0 full-speed to UART, 50bps–2Mbps, internal clock (no crystal).
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Debug consoles
- Flashing microcontrollers
- Talking to GPS and modules
Key features
What makes it different
Bridge
WCH CH340C: USB 2.0 full-speed to UART, 50bps–2Mbps, internal clock (no crystal)
Logic
3.3V TX/RX/DTR/RTS
Drivers
Built into Windows 10/11, macOS 10.14+, Linux
Power
VBUS 5V and 3.3V (AP2112K) on the header
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
| Bridge | WCH CH340C: USB 2.0 full-speed to UART, 50bps–2Mbps, internal clock (no crystal) |
|---|---|
| Logic | 3.3V TX/RX/DTR/RTS |
| Drivers | Built into Windows 10/11, macOS 10.14+, Linux |
| Power | VBUS 5V and 3.3V (AP2112K) on the header |
| Size | 25.4 × 17.8 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 7-pin 2.54 mm header · USB-C 16P receptacle (USB 2.0) — USB-C |
| Main IC | CH340C (LCSC C84681) |
| Revision | Rev A |
Performance
Speed
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VBUS | Power | 5V from USB (500mA) |
| 2 | GND | Ground | Ground |
| 3 | 3V3 | Power | LDO out, 300mA spare |
| 4 | TX | UART | Adapter → target RX |
| 5 | RX | UART | Target TX → adapter |
| 6 | DTR | Signal | Active low (Arduino auto-reset via 100nF) |
| 7 | RTS | Signal | Active low |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-C03 USB-C to UART Adapter (assembled)
- 1 × 7-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: VBUS, GND, 3V3, TX, RX, DTR
Compare
Which serial adapter?
| USB-C to UART Adapter (this board)This board | ET-C04 ESP32 / ESP8266 Programmer | ET-C05 RS-232 Transceiver | |
|---|---|---|---|
| What it does | CH340C serial adapter with 3.3 V logic | USB-C programmer with automatic reset and boot | Real RS-232 levels from 3.3 V or 5 V logic |
| Interface | — | — | — |
| Best for | Debug consoles | Flashing bare ESP32 modules | PLCs and lab instruments |
| Price | 27 AED | 19 AED | 29 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.