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CH340G
CH340G
| Part Number | CH340G |
|---|---|
| Manufacturer | WCH (Jiangsu Qinheng Microelectronics) |
| Category | Integrated Circuits (ICs) > Interface – Drivers, Receivers, Transceivers / USB to Serial Bridges |
| Description | Highly popular USB to serial UART bridge controller IC, supports external 12MHz crystal clock circuit, full-speed USB 2.0 interface, and hardware flow control in a standard SOP-16 package. |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
The CH340G is a cost-effective USB-to-UART bridge IC manufactured by WCH. It converts USB 2.0 Full-Speed ports into standard COM UART interfaces, fully compatible with legacy serial software across all mainstream operating systems.
This chip needs an external 12 MHz crystal and supports full-duplex UART with complete modem handshake signals including RTS, CTS, DTR, DSR, DCD and RI. Packaged in solder-friendly SOP-16, it is widely used for Arduino dev boards, MCU programming adapters, consumer electronics and industrial monitoring equipment.
Core Advantages
Massive Cross-Platform Driver Ecosystem
Emulates standard asynchronous COM serial communication channels natively with extensive operating system driver support across Windows, macOS, Linux, and Android platforms.
Comprehensive Full Hardware Flow Control
Integrates dedicated modem communication signals along with automatic hardware flow control logic lines to guarantee zero byte loss during fast baud data transfers.
Highly Adaptable Power Rail Voltage
Natively operates across both 5V and 3.3V configurations without external level-shifting buffers, interfacing smoothly with both legacy logic systems and modern low-voltage MCUs.
Optimized External Component Count
Minimizes board space and reduces overall Bill of Materials (BOM) complexity by streamlining internal transceiver matching networks and leveraging common external oscillators.
Key Specifications
| Brand | WCH Express USB Interface Product Series |
|---|---|
| RoHS Status | RoHS Compliant / Lead-Free / Eco-Standards Approved |
| EDA/CAD Model | 3D STEP Models, Schematic Symbols, and SOP-16 footprints available upon request |
| Warranty | 1-Year Standard Quality Warranty |
| Package / Case | SOP-16 / SOIC-16 (150-mil) |
| Mounting Type | Surface Mount Technology (SMD/SMT Solder Reflow) |
| Surface Marking / Silkscreen | CH340G Marking |
| USB Specification Interface | USB 2.0 Full-Speed Compliance Specification (12 Mbps maximum protocol rate) |
| Programmable Baud Rate Range | Supports programmable baud rates ranging from 50 bps up to 2 Mbps |
| UART Frame Configurations | Supports 5, 6, 7, or 8 data bits; odd, even, mark, space, and no parity; 1 or 2 stop bits |
| External Clock Requirement | Requires a 12 MHz crystal reference oscillator circuit connected across XI and XO pins |
| On-Chip FIFO Buffer | Integrated dual-way independent transmit and receive FIFO buffer registers (64 bytes TX / 64 bytes RX) |
| Hardware Modem Signals | Full hardware flow control: RTS, CTS, DTR, DSR, DCD, RI |
| Supply Voltage Scope (VCC) | Dual-mode capability spanning 4.0V to 5.3V (5V mode) or 3.0V to 3.6V (3.3V mode) |
| I/O Logic Level | Auto-adaptive 5V / 3.3V logic without external level shifter |
| UART Channel Count | 1 Independent Full-Duplex UART Channel |
| ESD Protection Grade | Built-in ±8kV HBM ESD protection for USB and UART pins |
| Sleep Mode Current | Low power sleep current < 1mA for battery-powered devices |
| Operating Temperature Range | -40°C to +85°C (Industrial Grade Operating Temperature) |
Typical Applications
- Microcontroller Evaluation Boards, MCU Program Download Tools, and DIY Kits (e.g., Arduino Uno R3/Nano boards)
- Industrial Control Interfaces, Serial RS232/RS485-to-USB Converter Bridges, and SCADA Data Nodes
- Consumer Electronic Testing Plugs, Diagnostic Scanner Tools, and Smart Network Meter Outlets
- Point of Sale (POS) Fiscal Printer Terminals, Barcode Scanners, and Weighing Scale Com Port Hubs
- Satellite Receivers, Routers/Modem Debugging Console Interfaces, and Telemetry Systems Links
Order & Shipping Info
| Minimum Order Quantity (MOQ) | 1 Piece |
|---|---|
| Shipping Time | Shipped within 1-2 business days |
| Delivery Time | 3-7 working days worldwide |
| Shipping Methods | DHL, UPS, FedEx, EMS |
| Payment Methods | T/T (Bank Transfer), PayPal, Credit Card, Western Union |
Technical Support
For datasheet, sample requests, stock check, or bulk pricing, please use the Quick Inquiry form. We will reply within 24 hours.
Frequently Asked Questions
Q1: Is your currently available inventory of the CH340G 100% genuine and original?
A: Yes, we guarantee that all CH340G chips in our warehouse are 100% brand-new, factory-original components directly from WCH. Each production lot goes through internal incoming control checks and is shipped in anti-static tubes or tape packaging layouts.
Q2: What is the primary difference between the CH340G and the CH340C variants in this chip family?
A: The primary difference centers on the clock source. The CH340G requires an external 12 MHz crystal along with decoupling capacitors connected to its oscillator pins to run. In contrast, the CH340C integrates an internal clock oscillator directly on-chip, completely eliminating the need for an external crystal component.
Q3: How do I correctly power the CH340G when interfacing with a 3.3V microcontroller versus a 5V system?
A: For 5V system interfaces, supply 5V directly to the VCC pin and connect a 0.1μF decoupling capacitor to the V3 pin. For 3.3V systems, tie both the VCC and V3 pins together directly to the 3.3V power rail supply line. This automatically switches the internal I/O buffers to match the target logic level without requiring external level shifters.
Q4: Where can our electronic hardware engineering team secure the official reference drivers or request a large volume price breakdown?
A: Please enter your project parameters and target volume goals into our Quick Inquiry web form on this page. Our interface component team will review your details and provide official drivers along with customized commercial tier pricing within 24 hours.
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