UART

UART stands for Universal Asynchronous Receiver-Transmitter. UART is a type of serial communication interface designed to transmit and receive data via a data bus. It allows two devices, such as computers, to carry out data transmission over a wired connection. UARTs convert incoming and outgoing data bytes into a serial bit stream. Asynchronous is a type of serial communication where the interfaces at each end are not synchronised by a common clock signal.

These particular UART devices are stand-alone integrated circuits (ICs). However, you can also find UARTs within microcontrollers (MCUs), as they only require two wires for communication.

UART ICs (integrated circuits) are semiconductor devices which can be integrated into your electronics designs to enable UART communication. UART is a popular method of communication in electronics projects. It enables computer hardware to communicate with other modems and serial devices.

When choosing a UART IC, ensure that it meets the requirements of the modem transmission rate.

What does a UART consist of?

One side of the UART feature around 8 data lines and the control pins. The other side of the UART has two serial wires, the Transmission (TX) and the Receiving (RX).

Where is UART used?

  • Microcontroller based devices
  • GPS receivers
  • Bluetooth devices
  • Modems
  • Wireless communications

Communication Standards

UARTs may feature a communication standard which defines the signals between devices. These standards include RS-232, RS-422 and RS-485.

What is baud rate?

UART baud rate is the speed at which the data is transferred which is given in bits per second (bit/s or bps). The devices that you are communicating between should both have the same baud rate.


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Description Price Number of Channels per Chip Standard Supported Transmit FIFO Receive FIFO Maximum Data Rate Transmitter and Receiver FIFO Counter Mounting Type Package Type Pin Count Typical Operating Supply Voltage Dimensions Length Width Height
RS Stock No. 687-7720
Mfr. Part No.FT2232HL
BrandFTDI Chip
$11.85
Each
units
2 RS232, RS422, RS485 - - 480Mbit/s - Surface Mount LQFP 64 - 10 x 10 x 1.4mm - - -
RS Stock No. 170-9070
Mfr. Part No.FT2232HL
BrandFTDI Chip
$8.651
Each (On a Reel of 1000)
units
2 RS232, RS422, RS485 - - 480Mbit/s - Surface Mount LQFP 64 - 10 x 10 x 1.4mm - - -
RS Stock No. 757-0010
Mfr. Part No.FT230XS-R
BrandFTDI Chip
$3.47
Each (In a Pack of 2)
units
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in - - -
RS Stock No. 923-1581
Mfr. Part No.FT230XS-R
BrandFTDI Chip
$2.758
Each (On a Reel of 3000)
units
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in - - -
RS Stock No. 757-0032
Mfr. Part No.FT231XS-R
BrandFTDI Chip
$3.855
Each (In a Pack of 2)
units
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount SSOP 20 5 V 0.344 x 0.157 x 0.059in - - -
RS Stock No. 923-1607
Mfr. Part No.FT231XS-R
BrandFTDI Chip
$2.854
Each (On a Reel of 2000)
units
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount SSOP 20 5 V 0.344 x 0.157 x 0.059in - - -
RS Stock No. 757-0026
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
$3.34
Each (In a Pack of 2)
units
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount QFN 16 5 V 4 x 4 x 0.75mm - - -
RS Stock No. 923-1600
Mfr. Part No.FT221XS-R
BrandFTDI Chip
$2.60
Each (On a Reel of 3000)
units
1 SIE, UART 512B 512B 1Mbit/s Yes Surface Mount SSOP 20 5 V 0.344 x 0.157 x 0.059in - - -
RS Stock No. 757-0036
Mfr. Part No.FT221XS-R
BrandFTDI Chip
$3.84
Each (In a Pack of 2)
units
1 SIE, UART 512B 512B 1Mbit/s Yes Surface Mount SSOP 20 5 V 0.344 x 0.157 x 0.059in - - -
RS Stock No. 757-0023
Mfr. Part No.FT201XS-R
BrandFTDI Chip
$3.035
Each (In a Pack of 2)
units
1 SIE, UART 512B 512B 3.4Mbit/s Yes Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in - - -
RS Stock No. 923-1593
Mfr. Part No.FT201XS-R
BrandFTDI Chip
$2.854
Each (On a Reel of 3000)
units
1 SIE, UART 512B 512B 3.4Mbit/s Yes Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in - - -
RS Stock No. 923-1597
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
$2.758
Each (On a Reel of 5000)
units
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount QFN 16 5 V 4 x 4 x 0.75mm - - -
RS Stock No. 923-1616
Mfr. Part No.FT240XQ-R
BrandFTDI Chip
$2.652
Each (On a Reel of 5000)
units
1 SIE 512B 512B 1Mbit/s Yes Surface Mount QFN 24 5 V 4 x 4 x 0.75mm - - -
New
RS Stock No. 216-8418
Mfr. Part No.FT200XD-T
BrandFTDI Chip
$3.114
Each (In a Pack of 5)
units
- - 512B 512B 3.4Mbps - - DFN 10 +3.3 → 5.25 V - - - -
RS Stock No. 757-0014
Mfr. Part No.FT220XS-R
BrandFTDI Chip
$3.605
Each (In a Pack of 2)
units
1 SIE, UART 512B 512B 500kbit/s Yes Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in - - -
New
RS Stock No. 216-8416
Mfr. Part No.FT200XD-T
BrandFTDI Chip
$2.975
Each (In a Tray of 490)
units
- - 512B 512B 3.4Mbps - - DFN 10 +3.3 → 5.25 V - - - -
RS Stock No. 170-9074
Mfr. Part No.FT220XS-R
BrandFTDI Chip
$2.237
Each (On a Reel of 3000)
units
1 SIE, UART 512B 512B 500kbit/s Yes Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in - - -
New
RS Stock No. 216-8420
Mfr. Part No.FT201XQ-T
BrandFTDI Chip
$3.662
Each (In a Pack of 5)
units
- - 512B 512B 3.4Mbps - - QFN 16 +3.3 → 5.25 V - - - -
New
RS Stock No. 216-8419
Mfr. Part No.FT201XQ-T
BrandFTDI Chip
$2.657
Each (In a Tray of 490)
units
- - 512B 512B 3.4Mbps - - QFN 16 +3.3 → 5.25 V - - - -
RS Stock No. 757-0051
Mfr. Part No.FT240XQ-R
BrandFTDI Chip
$3.205
Each (In a Pack of 2)
units
1 SIE 512B 512B 1Mbit/s Yes Surface Mount QFN 24 5 V 4 x 4 x 0.75mm - - -