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Small green circuit board with USB-C female port, CH340G chip, three status LEDs and a voltage-select jumper

Fervit

Fervit USB-C Female to TTL UART CH340G 3.3V 5V Adapter

SKU CH-R3QK-2JQ12

Converts USB-C to TTL UART with CH340G chip, selectable 3.3V or 5V levels via jumper, three status LEDs, and drivers for 32- and 64-bit Windows from 98 to 8

  • Selectable 3.3 V or 5 V logic levels via jumper
  • CH340G chip avoids PL-2303 driver conflicts on modern systems
  • Three status LEDs show power, TX and RX activity at a glance
  • Broad Windows support from 98 through Win8 32/64-bit
  • STC-recommended USB-to-TTL solution for microcontroller programming

USB-C to TTL UART Adapter for Microcontroller

The Fervit USB-C Female to TTL UART adapter uses a CH340G chip to convert USB-C signals into 3.3V or 5V TTL serial levels selectable by jumper. It targets engineers and hobbyists who need a stable serial link for flashing STC microcontrollers, upgrading firmware on embedded boards, or maintaining hard-disk and router hardware. Three onboard LEDs show power, TX and RX activity so connection status is visible without extra instruments.

Replaces PL-2303 Based Converters with Driver Issues

This module supersedes older PL-2303 designs that can fail to download code because of driver mismatches across different computers or Windows versions. The CH340G is the STC officially recommended USB-to-TTL chip and works with Windows 98, ME, 2000, XP, Server 2003, Vista, Server 2008, Win7 and Win8 in both 32-bit and 64-bit editions. The jump in reliability is worth it when a PL-2303 adapter refuses to enumerate or drops data during a critical flash operation.

Fits Embedded Workbenches Needing Selectable Logic

The board plugs into any USB-C host port and breaks out TTL pins at either 3.3V or 5V, letting one adapter serve both modern low-voltage MCUs and legacy 5V systems. It requires only the supplied driver and a terminal or flash utility; no external power supply is needed because the USB-C bus powers the converter. The compact form factor leaves bench space free for the target board, programmer clips and a logic analyser when deeper debugging is required.

Highlights

  • Selectable 3.3 V or 5 V logic levels via jumper
  • CH340G chip avoids PL-2303 driver conflicts on modern systems
  • Three status LEDs show power, TX and RX activity at a glance
  • Broad Windows support from 98 through Win8 32/64-bit
  • STC-recommended USB-to-TTL solution for microcontroller programming

Specifications

BrandFervit

Questions about this item

Does the USB-C female connector need any specific cable or port orientation to fit?

The adapter has a USB-C female receptacle that accepts any standard USB-C male plug; orientation does not matter because USB-C is reversible.

What is the most common mistake when wiring the CH340G module for the first time?

Forgetting to set the voltage jumper to 3.3 V or 5 V before powering the board, which can leave the target device at the wrong logic level.

Which components on this adapter are most likely to need replacement after extended use?

The CH340G chip and the voltage-selection jumper are the only active parts; the three status LEDs (PWR, TXD, RXD) may dim over very long service life.

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