The TTL-232R-3V3-AJ is a USB to Serial (TTL level) converter cable which allows for a simple way to connect TTL interface devices to USB.  This version of FTDI's USB to TTL serial adapter cables has it's I/O pins configured to operate at 3.3V levels.

The TTL-232R-3V3-AJ uses a FT232RQ device which is housed inside the USB 'A' connector and is terminated with a 3.5mm audio jack connector which provides access to the Transmit (Tx), Receive (Rx) and GND signals.  The Tx and Rx lines operate at 3.3V levels

The TTL-232R-3V3-AJ is fully RoHS compliant and is supplied loose packed in an anti-static bag.  It is FCC and CE approved.
 

Several variants of the TTL-232R-3V3-AJ are available:

• TTL-232R (TTL-232R with 5V IOs)

• TTL-232R-3V3 (TTL-232R with 3.3V IOs)

• TTL-232R-AJ (Audio Jack connector, 5V IOs)

• TTL-232R-PCB (Populated PCB from the TTL-232R USB connector, 5V IOs)

• TTL-232R-3V3-PCB (Populated PCB from the TTL-232R-3V3 USB connector, 3.3V IOs)

• TTL-232R-WE (No connector at serial end, 5V IOs)

• TTL-232R-3V3-WE (No connector at serial end, 3.3V IOs)

Features include:

• TTL-232R-3V3-AJ Converter Cable provides a USB to TTL Serial header interface via a 3.5mm stereo jack.

• On-board FT232RQ provides single chip USB to asynchronous serial data transfer interface.

• Entire USB protocol handled on the FT232RQ chip - No USB-specific firmware programming required.

• Connect a microcontroller/PLD/FPGA directly to a PC USB port.

• Fully compatible with existing legacy COM port software.

• FTDI’s royalty-free VCP drivers allow for communication as a standard COM port and D2XX ‘direct’ drivers provide DLL application programming interface.

• Data transfer rates from 300 Baud to 3 Mega Baud at TTL levels.

• UART interface support for 7 or 8 data bits, 1 or 2 stop bits and odd/even/mark/space/ no parity.

• 3.3V CMOS drive outputs and 5V safe TTL inputs makes the TTL-232R-AJ easy to interface to 3.3V MCUs.

• Support for FT232R FTDIChip-ID™ feature.

• Cable supply voltage comes from USB - no external supply required.

• 3-ring stereo jack connector (Tx, Rx and GND).

• Low USB bandwidth consumption.

• HCI/OHCI/EHCI host controller compatible.

• USB 2.0 Full Speed compatible.

• -40°C to +85°C operating temperature range.

• Connect to a PC via USB ‘A’ plug on 1.80 meter (6 foot) cable.

• A 5V TTL I/O version is also available (TTL-232R-AJ).

• Custom versions also available (subject to MOQ).

• TTL-232R-3V3-AJ Datasheet

• VCP Drivers
• D2XX Drivers
• Schematic

The TTL-232R-3V3-AJ is competitively priced at $20 each in small quantities.  It is available on-line from the FTDI Chip Shop, directly from FTDI or through the FTDI worldwide sales network.