The WCH CH340B is a USB-to-serial converter chip from Nanjing Qinheng Microelectronics (WCH), designed for reliable UART communication between computers and embedded devices. It features an integrated EEPROM, allowing storage of USB descriptors without requiring external memory. The CH340B supports standard serial interfaces and is commonly used in development boards, USB-to-TTL adapters, and industrial control hardware. Compatible with Windows, Linux, and macOS via official WCH drivers, it offers stable data transfer, low power consumption, and a compact design. The CH340B is valued for its flexibility, ease of integration, and cost-effective implementation in embedded systems.