CH330N is a New USB to Serial Chip in an SOP8 Package

Earlier this month we covered Air602 low cost Arm WiFi module, and while it’s not clear whether it will ever compete with ESP8266 due to software support, some readers noticed an interesting new chip on the corresponding development board: WCH CH330N USB to serial chip with features similar to CH340, but less pins (e.g. DTS, and  CTS are missing), and available in a tiny SOP8 package.


CH330N comes with built-in crystal oscillator, and supports baud rate from 50 bps to 2 Mbps. You’ll find more hardware technical details in the datasheet in Chinese.

CH330(N) works with CH340/CH341 driver as pointed out by Icenowy Zheng who made a small USB to TTL debug board based on the chip to practice PCB drawing with KiCAD. She also mentioned the USB ID and behavior of CH330 is the same with CH340.

CH330 SchematicsCH330 / CH330N chip is still nowhere to be found on Aliexpress, but you can purchase it for around 30 cents in LSCS, as well as in a few shops on Taobao and for 1.75 CNY ($0.25) and up.

Thanks to Zoobab for the tip

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