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CH343G
CH343G
| Part Number | CH343G |
|---|---|
| Manufacturer | WCH (Jiangsu Qinheng Microelectronics) |
| Category | Integrated Circuits (ICs) > Interface – Drivers, Receivers, Transceivers / USB to Serial Bridges |
| Description | Next-generation high-speed USB to serial UART bridge controller IC, featuring integrated internal clock, automatic baud rate identification, transfer speed up to 6 Mbps, and multi-voltage I/O support in standard SOP-16 package. |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
The CH343G is a high-performance USB-to-UART bridge IC made by WCH, upgraded from classic CH340 series. It converts USB 2.0 Full-Speed interface to high-speed asynchronous serial port, supporting native USB CDC drivers and dedicated VCP vendor drivers for plug-and-play across all mainstream OS. Equipped with built-in clock oscillator, it eliminates external 12MHz crystal and peripheral capacitors to simplify PCB layout. It supports baud rates up to 6 Mbps with large independent TX/RX FIFO buffers and full hardware & software flow control to avoid data loss. Packaged in solder-friendly SOP-16, it is widely used for high-speed industrial communication, IoT gateways and MCU debug programming tools.
Core Advantages
Ultra-High-Speed Data Performance
Supports programmable baud rates from 50 bps up to 6 Mbps, meeting high-throughput demand of industrial data logging devices.
Crystal-Less Internal Clock Design
Integrated precise on-chip clock generator removes external crystal and matching capacitors, lowering BOM cost and shrinking PCB space.
Independent Multi-Voltage VIO Pin
Dedicated VIO pin supports UART signal level matching with 5V, 3.3V, 2.5V or 1.8V MCUs without extra level shift circuits.
Dual Driver Compatibility
Compatible with both WCH high-speed VCP drivers and system native USB CDC class drivers for quick deployment on various operating systems.
Key Specifications
| Brand | WCH High-Performance Advanced Interface 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 Reflow Soldering) |
| Surface Marking / Silkscreen | CH343G Marking |
| USB Interface Core | USB 2.0 Full Speed Compliance Device Layer (12 Mbps data capability) |
| Supported Baud Rate Range | 50 bps to 6 Mbps continuously adjustable with automatic baud matching logic |
| UART Signaling Formats | Supports 5, 6, 7, or 8 data bits; Odd, Even, Mark, Space, or No Parity; 1 or 2 stop bits |
| UART Channel Count | 1 Independent Full-Duplex UART Channel |
| Crystal Design | Built-in internal oscillator, no external 12MHz crystal required |
| Hardware Flow Control Signals | Provides full modem controls (RTS, CTS, DTR, DSR, DCD, RI) along with automated hardware and software flow control |
| On-Chip RAM Buffers | 64-byte independent Transmit and Receive FIFO buffers |
| Supported Driver Type | WCH VCP proprietary driver + OS native USB CDC class driver |
| ESD Protection Grade | ±8kV HBM ESD protection for USB and UART signal pins |
| Sleep Mode Current | Low power sleep current < 1mA for battery-powered devices |
| Operating Voltage Scope (VCC) | 3.3V to 5.3V Main Core Power; Supports VIO downstream logic ranges from 1.8V to 5V |
| Operating Temperature Range | -40°C to +85°C (Industrial Grade Operating Temperature) |
Typical Applications
- High-Speed Microcontroller/FPGA Development Boards, In-Circuit Programmers, and JTAG Debug Brackets
- Industrial Telemetry Systems, RS485/RS232-to-USB Multi-Drop Converters, and Modbus RTU Interfaces
- Internet of Things (IoT) Edge Gateways, Smart Wireless Router Consoles, and Cellular Modem Links
- Automotive Telematics Diagnostic Scanner Equipment, Fleet Tracking Modules, and Sensor Processing Hubs
- Point-of-Sale (POS) Hardware Systems, Smart Meter Networks, and Automated Production Line Instruments
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 stock of the CH343G 100% genuine and original?
A: Yes, we guarantee that all CH343G bridge controllers in our inventory are 100% brand-new, factory-original products from WCH. Each production batch undergoes rigorous quality controls and is dispatched in original anti-static protective tubes or tape-and-reel configurations.
Q2: What are the main feature improvements of the CH343G compared to the classic CH340G?
A: The CH343G introduces major performance upgrades over the older CH340G: it pushes the maximum baud rate from 2 Mbps to 6 Mbps, features an integrated clock oscillator that entirely eliminates the need for an external crystal, provides a dedicated VIO pin for low-voltage (1.8V/2.5V) MCU interfacing, and supports OS-native USB CDC class drivers natively.
Q3: How do I utilize the independent VIO pin on the CH343G to match 1.8V or 3.3V logic signals?
A: To match lower-voltage logic levels, feed main operating voltage (e.g., 5V from USB) to the VCC pin, and connect your microcontroller’s logic reference supply (1.8V / 3.3V / 2.5V) directly to the VIO pin. The CH343G’s internal level converters automatically shift UART TX/RX signals to match the MCU logic rail safely.
Q4: How can our technical hardware engineering division request official reference circuitry or bulk commercial quotes?
A: Please submit your exact design criteria and expected order volume through our Quick Inquiry web form on this page. Our technical interface support group will review your parameters and respond with data files and customized volume pricing matrices within 24 hours.
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