Quick answer
For most Arduino programming, the FTDI USB Serial Port Adapter offers flexible voltage output and higher speed support, while the USB to RS232 TTL cable is a budget-friendly option for basic serial communication.
Voltage and compatibility
The FTDI adapter provides both 5V and 3.3V supply outputs, making it suitable for boards that require lower logic levels, such as 3.3V Arduino-compatible boards. The TTL cable only outputs 5V, which may not be safe for 3.3V devices without a level shifter.
Speed and baud rate range
The FTDI adapter supports baud rates from 300 bps up to 3 Mbps, covering everything from slow sensors to high-speed data logging. The TTL cable's PL2303HX chip is limited to typical Arduino speeds (usually up to 115200 bps), which is sufficient for most sketches but not for high-throughput applications.
Cable length and physical setup
The TTL cable comes with a 100 cm length, giving you more reach from your computer to the project. The FTDI adapter includes an 18.4 cm cable, which is shorter but often more convenient for breadboard or desk work. Choose based on your workspace layout.
Trade-offs at a glance
- Voltage flexibility: FTDI adapter offers both 5V and 3.3V; TTL cable is 5V only.
- Speed range: FTDI supports up to 3 Mbps; TTL cable is limited to around 115200 bps. If you need high-speed data transfer, choose the FTDI adapter.
- Cable length: TTL cable is 100 cm; FTDI cable is 18.4 cm. Longer cable gives more reach but may introduce more noise.
- Cost: FTDI adapter costs USD 2.83 (down from USD 4.16); TTL cable costs USD 0.66 (down from USD 1.07). The TTL cable is significantly cheaper, but you lose voltage and speed flexibility.
Product facts at a glance
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FTDI USB Serial Port Adapter: FT232RL chip, supports 5V and 3.3V outputs, baud rate 300 bps to 3 Mbps. You can program both 5V and 3.3V Arduino boards without an extra level shifter, and handle faster serial protocols.
FTDI USB Serial Port Adapter
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USB to RS232 TTL Serial Interface Cable: PL2303HX chip, 5V output only, cable length 100 cm. It is a low-cost option for basic serial communication with 5V devices, but cannot directly interface with 3.3V logic.
USB to RS232 TTL Serial Interface Cable
Which one should you choose?
Best for
- Users who need to program both 5V and 3.3V Arduino boards
- Projects requiring baud rates above 115200 bps
Not for
- Budget-focused projects that only use 5V logic
- Setups where a longer cable is essential for physical placement
