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Small USB-C dongle with green circuit board, three LEDs and a jumper block, pin header on the opposite side

Fervit

Fervit USB-C to TTL UART CH340G 3.3V 5V adapter

SKU CH-M682-30V4A

USB-C to TTL UART adapter with CH340G chip, selectable 3.3V or 5V levels, three status LEDs, and Windows 98 through Win8 32/64-bit support

  • USB-C connector simplifies modern laptop connections
  • CH340G chip ensures stable STC microcontroller programming
  • Jumper selects 3.3 V or 5 V logic levels
  • Three status LEDs show power, TX and RX activity
  • Broad Windows support from 98 through Win8 32/64-bit

USB-C to TTL UART adapter with CH340G

This Fervit adapter converts a USB-C port to a TTL serial interface using the CH340G chip. It is intended for engineers and hobbyists who program STC microcontrollers, upgrade firmware on routers or hard drives, or need a stable serial connection for embedded development. The module draws power directly from the USB-C host.

Suits STC workflows; not for RS-232 voltage levels

The board is designed around the STC officially recommended CH340G chipset, providing driver stability across Windows 98 through Windows 8 on both 32-bit and 64-bit systems. Three onboard LEDs show power, TX and RX activity without extra instruments. Buyers who need true RS-232 voltage swings or support for operating systems beyond Windows 8 should look at other solutions.

Jumper-selectable 3.3 V or 5 V TTL logic

A hardware jumper sets the I/O level to either 3.3 V or 5 V, matching the target device’s logic voltage. This single setting determines whether the adapter can communicate safely with a given microcontroller or module. Verify the required logic level before purchasing.

Highlights

  • USB-C connector simplifies modern laptop connections
  • CH340G chip ensures stable STC microcontroller programming
  • Jumper selects 3.3 V or 5 V logic levels
  • Three status LEDs show power, TX and RX activity
  • Broad Windows support from 98 through Win8 32/64-bit

Specifications

BrandFervit

Questions about this item

Does the adapter come with jumper wires or headers, or do I need to supply them?

The module is supplied as a bare board with a USB-C plug and a jumper for 3.3 V or 5 V selection; pin headers or dupont wires for the TTL side are not included.

Should I pick the 3.3 V or 5 V setting for an STC microcontroller?

Use the onboard jumper to match the target MCU voltage — 3.3 V for 3.3 V logic devices, 5 V for 5 V logic — the CH340G supports both levels.

Will the CH340G chip work on a 64-bit Windows 7 machine without extra drivers?

The CH340G requires the vendor driver (download U2-079) on every supported Windows version, including 64-bit Windows 7; it is not natively built into the OS.

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