The WCH CH340E is a compact USB-to-serial (UART) converter chip from Nanjing Qinheng Microelectronics (WCH), designed for space-constrained embedded applications. It features an integrated crystal oscillator, removing the need for external timing components and simplifying PCB design. The CH340E supports standard serial communication and is commonly used with microcontrollers, development boards, and USB-to-TTL adapters. It is compatible with Windows, Linux, and macOS using official WCH drivers. With low power consumption, reliable data transfer, and a small footprint package, the CH340E is well suited for modern embedded devices, IoT hardware, and compact serial interfaces.