SMUGDESK USB to TTL Serial Adapter Cable FTDI Chip 3.3V UART 6ft 3.5mm Stereo Audio Jack TTL-232R-3.3v-AJ

FTDI USB-to-TTL cable 3.3 V 6 ft

This USB-to-TTL serial adapter uses an authentic FTDI chip to convert USB signals to 3.3 V UART levels. The six-foot cable ends in a 3.5 mm stereo audio jack matching the TTL-232R-3.3v-AJ specification for direct connection to compatible debug headers. Plug-and-play operation is supported on Windows, Linux and macOS, with automatic recognition on most current systems. It is intended for firmware flashing, hardware troubleshooting and serial data monitoring on low-voltage embedded hardware.

Embedded developers and router technicians

Engineers debugging 3.3 V microcontrollers, Bluetooth modules, Wi-Fi units or router firmware will find the voltage level and jack format convenient. Users whose target hardware requires 5 V TTL logic cannot connect this cable directly without an external level shifter. Projects needing a standard DB-9 or pin-header connector instead of a 3.5 mm jack will need a different adapter or a custom cable assembly.

3.3 V logic level output

The single decisive specification is the fixed 3.3 V TTL output voltage, which protects low-voltage MCUs and sensors but makes the cable unsuitable for 5 V systems unless a level shifter is added. Confirm that your device's 3.5 mm jack pinout matches the TTL-232R-3.3v-AJ assignment before connecting.