# CH9101N (Component) ## Description USB to Serial Port Chip CH9101 CH9101N is a high-speed USB-to-UART bridge IC developed by WCH (Qinheng Electronics). It converts a USB 2.0 Full-Speed interface into a standard asynchronous UART serial interface, enabling seamless communication between a computer and microcontrollers, embedded systems, industrial equipment, and other UART-based devices. The device features an integrated clock oscillator and power-on reset circuitry, minimizing external components and simplifying PCB design. Housed in a compact SOP-8 package, the CH9101N supports UART logic voltages from 1.8 V to 5 V, making it suitable for a wide range of low-power and mixed-voltage applications. It is commonly used for USB debugging, firmware downloading, serial communication, and IoT development. Key Features USB 2.0 Full-Speed compliant device interface USB-to-UART bridge with baud rates up to 3 Mbps Supports 1.8 V, 2.5 V, 3.3 V, and 5 V UART I/O levels Integrated clock oscillator (no external crystal required) Built-in power-on reset circuitry Full-duplex UART communication Supports hardware flow control (RTS/CTS) Compatible with standard virtual COM port (VCP) drivers Compact SOP-8 package with minimal external components Suitable for MCU programming, debugging, and serial communication applications #CH9101N #WCH #USBtoUART #USBBridge #UART #USB20 #SerialCommunication #EmbeddedSystems #Microcontroller #IoT #IndustrialAutomation #Debugging #FirmwareDownload #SOP8 #InterfaceIC ## Component Details - **Owner:** adrian95 - **Created:** 6/27/2026 - **Last Updated:** 6/27/2026 - **Visibility:** Public - **Package or Case Code:** SOP-8 - **License:** https://creativecommons.org/licenses/by/4.0/ - **Datasheet URL:** https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/d45a9f05fa52462d4e28a1e858036708a3b60f5eae65ce7607d3388b0ab24f5f.pdf - **Manufacturer Name:** WCH - **Manufacturer Part Number:** CH9101N - **LCSC Part Number:** C5187518 - **Symbol Style:** parametric-v1 - **Part Type:** Integrated Circuit - **Part Type:** Integrated Circuits - **Sub-Type:** Logic - **MPN:** CH9101N - **Mount Type:** Standard - **Package / Case Code:** 8-SOP - **Pin Count:** 8 - **Logic Function:** AND ## Pins | Pin | Name | Type | |-----|------|------| | 1 | GND | | | 2 | TXD | | | 3 | VIO | | | 4 | RXD | | | 5 | UD+ | | | 6 | UD- | | | 7 | VDD5 | | | 8 | V3 | | --- *Generated from [https://www.flux.ai/adrian95/ch9101n~gaz](https://www.flux.ai/adrian95/ch9101n~gaz)*