WCH

WCH (Nanjing Qinheng Microelectronics) is the go-to source for cost-effective USB connectivity and RISC-V microcontrollers in the Chinese electronics ecosystem. The profiles here cover both strengths: the USB bridge line has the CH340G (SOP-16), the CH340E (MSOP-10) and the CH340C with built-in crystal — the most widely used USB UART chips on development boards and industrial adapters — alongside the CH341A (SOP-28), which adds parallel-port, I2C, SPI and GPIO bridging for multi-interface designs. The microcontroller line adds the CH32V307 and the CH32V003 RISC-V MCUs. WCH ordering codes encode the package and interface variant, and the E suffix on the CH340E denotes the MSOP-10 package. Confirm the complete part number against the BOM, since package variants are not footprint-compatible.

Sourcing notes for WCH parts. Always quote the complete manufacturer ordering code — package, temperature grade, speed or accuracy grade, and packing (reel, tube or tray) all change availability and price, and suffixes are where most mismatches happen. Check the lifecycle status on the manufacturer site before committing to a multi-year build; parts flagged not-recommended or obsolete need a last-time-buy plan or a verified alternate lined up early. With every offer, request traceability documents — date code, lot code and original packing — and confirm the inspection steps your supplier applies to high-risk lots.