# CH9102X (Component) ## Description The CH9102X is a high-speed USB-to-UART bridge IC developed by WCH (Jiangsu Qinheng Microelectronics). It enables seamless communication between a USB host and UART-based embedded systems, making it ideal for programming, debugging, firmware updates, and serial data communication. The device integrates a USB 2.0 Full-Speed interface, an internal clock, power-on reset, and firmware, eliminating the need for an external crystal oscillator. The CH9102X variant supports 3.3 V UART I/O and is widely used on development boards such as ESP32 and other MCU-based designs. Key Features USB 2.0 Full-Speed (12 Mbps) compliant device interface USB-to-UART bridge supporting baud rates from 50 bps to 4 Mbps 3.3 V UART I/O (CH9102X variant) Integrated clock oscillator (no external crystal required) Built-in power-on reset circuit Hardware full-duplex UART with independent TX/RX buffers Supports 5, 6, 7, or 8 data bits Supports None, Odd, Even, Mark, and Space parity Supports RTS/CTS hardware flow control Supports MODEM signals: RTS, CTS, DTR, DSR, DCD, and RI TNOW output for automatic RS-485 transmit/receive control Compatible with built-in CDC drivers and vendor VCP drivers on major operating systems Available in compact RoHS-compliant QFN packages #CH9102X #USBtoUART #USBBridge #UART #SerialConverter #WCH #USB20 #EmbeddedSystems #ESP32 #MCU #RS485 #FirmwareUpdate #Debugging #IoT #PCBDesign ## Component Details - **Owner:** adrian95 - **Created:** 6/26/2026 - **Last Updated:** 6/26/2026 - **Visibility:** Public - **License:** https://creativecommons.org/licenses/by/4.0/ - **Manufacturer Name:** WCH - **Part Type:** Integrated Circuits - **Datasheet URL:** https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/00ed7dd62a617aedbd58152306b45bb76dee6996efd2acd77112e82a6668136f.pdf - **Package or Case Code:** QFN28X5 5x5mm 0.5mm pitch with exposed pad - **Manufacturer Part Number:** CH9102X - **Symbol Style:** parametric-v1 - **Used in:** 3 projects ## Distributor Pricing (qty 1) *Pricing shown for quantity 1. For price breaks and other quantities, open in Flux.* | Distributor | Unit Price (qty 1) | Stock | |------------|--------------------|-------| | [LCSC](https://www.lcsc.com/product-detail/C5187522.html) | $1.2068 | 858 | - **Part Type:** Integrated Circuits - **Sub-Type:** Logic - **MPN:** CH9102X - **Mount Type:** PCB - **Package / Case Code:** QFN - **Pin Count:** 29 - **Logic Function:** AND - **Compliance:** Rohs ## Pins | Pin | Name | Type | |-----|------|------| | 1 | DCD | | | 2 | RI | | | 3 | GND | | | 4 | UD+ | | | 5 | UD- | | | 6 | V3 | | | 7 | VDD5 | | | 8 | VBUS | | | 9 | RST# | | | 10 | ACT# | | | 11 | SUSPEND# | | | 12 | SUSPEND | | | 13 | NC | | | 14 | NC | | | 15 | NC | | | 16 | WAKEUP/GPIO3 | | | 17 | TNOW/GPIO2 | | | 18 | RXS/GPIO1 | | | 19 | TXS/GPIO0 | | | 20 | GPIO6 | | | 21 | GPIO5 | | | 22 | V3 | | | 23 | CTS | | | 24 | RTS | | | 25 | RXD | | | 26 | TXD | | | 27 | DSR | | | 28 | DTR | | | 29 | GND | | --- *Generated from [https://www.flux.ai/adrian95/ch9102x~fvh](https://www.flux.ai/adrian95/ch9102x~fvh)*