FTDI Chip TTL-234X Converter Cables

FTDI TTL-234X series cables are USB to TTL level serial UART converter cables. The cables utilize the FT234XD USB to basic UART interface device which handles USB signaling and protocols. Each TTL-234X cable includes a small internal electronic circuit board and delivers a 3Mbps data transfer rate. Cables are offered at TTL levels of +5V or +3.3V. The USB connector cable is offered with either a 6-way SIL 0.1" pitch connector, a 3.5mm audio jack, an 8-way keyed 2mm connector or is wire-ended. The cable length is 1.8m.


  • TTL-234X Converter Cable provides a USB to TTL Serial interface with various end connectors.
  • Onboard FT234XD provides a single-chip USB to asynchronous serial data transfer interface.
  • Entire USB protocol handled by the electronics in the cable USB.
  • Connect directly to a microcontroller UART or I/O pins.
  • UART interface support for 7 or 8 data bits, 1 or 2 stop bits and odd / even / mark / space / no parity.
  • Fully assisted hardware (RTS#/CTS#) or X-On / X-Off software handshaking.
  • Data transfer rates from 300 baud to 3 Mbaud at TTL levels.
  • Internal MTP MEMORY with user writeable area.
  • 5V CMOS drive outputs and 5V safe TTL inputs make the TTL-234X easy to interface to 5V MCU’s.
  • FTDI’s royalty-free VCP allows for communication as a standard emulated COM port and D2XX ‘direct’ drivers provide DLL application programming interface.
  • +5V output allows external logic to be powered from the USB port.
  • 6-way outputs provide Tx, Rx, RTS#, CTS#, VCC, and GND (except Audio Jack which provides only TX, RX, and GND).
  • 8-way, keyed connector to support FTDI VDRIVE2 and VMUSIC2.
  • 3-way Audio Jack connector provides Tx, Rx, and GND.
  • Low USB bandwidth consumption. 
  • UHCI / OHCI / EHCI host controller is compatible.
  • USB 2.0 Full Speed compatible.
  • -40°C to +85°C operating temperature range.
  • The cable length is 1.80m (6 feet).
  • FCC and CE compliant.
  • Custom versions are also available (subject to MOQ).


  • USB to Serial TTL Level Converter
  • Upgrading Legacy Peripherals to USB
  • Interface Microcontroller UART or I/O to USB
  • Interface FPGA / PLD to USB
  • Firmware download and debug cable
Published: 2017-04-20 | Updated: 2022-03-11