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. 923-1581
Mfr. Part No.FT230XS-R
BrandFTDI Chip
TWD51.90
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. 757-0010
Mfr. Part No.FT230XS-R
BrandFTDI Chip
TWD75.50
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. 923-1597
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
TWD51.90
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. 170-9074
Mfr. Part No.FT220XS-R
BrandFTDI Chip
TWD53.60
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 - - -
RS Stock No. 757-0026
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
TWD72.50
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. 757-0014
Mfr. Part No.FT220XS-R
BrandFTDI Chip
TWD72.50
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 - - -
RS Stock No. 687-7720
Mfr. Part No.FT2232HL
BrandFTDI Chip
TWD217.00
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
TWD180.70
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. 686-5941
Mfr. Part No.ST16C554DCJ68-F
BrandMaxLinear
TWD347.00
Each
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm - - -
RS Stock No. 686-5954
Mfr. Part No.ST16C554DIJ68-F
BrandMaxLinear
TWD407.00
Each
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm - - -
RS Stock No. 170-4453
Mfr. Part No.ST16C554DIJ68-F
BrandEXAR
TWD365.90
Each (In a Tube of 19)
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm - - -
RS Stock No. 170-4449
Mfr. Part No.ST16C554DCJ68-F
BrandEXAR
TWD282.50
Each (In a Tube of 19)
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm - - -
RS Stock No. 124-2422
Mfr. Part No.SC16IS762IPW,112
BrandNXP
TWD212.20
Each (In a Tube of 51)
units
2 IrDA, UART - - 5Mbit/s Yes Surface Mount TSSOP 28 2.5 V, 3.3 V 9.8 x 4.5 x 0.95mm - - -
RS Stock No. 816-0239
Mfr. Part No.SC16IS762IPW,112
BrandNXP
TWD212.70
Each (In a Pack of 3)
units
2 IrDA, UART - - 5Mbit/s Yes Surface Mount TSSOP 28 2.5 V, 3.3 V 9.8 x 4.5 x 0.95mm - - -
RS Stock No. 923-1607
Mfr. Part No.FT231XS-R
BrandFTDI Chip
TWD53.20
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. 686-5995
Mfr. Part No.XR16L788CQ-F
BrandMaxLinear
TWD1,330.00
Each
units
8 IrDA 64B 64B 6.25Mbit/s Yes Surface Mount PQFP 100 2.97 → 5.5 V 20.1 x 14.1 x 3.05mm - - -
RS Stock No. 757-0032
Mfr. Part No.FT231XS-R
BrandFTDI Chip
TWD82.50
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. 913-4244
Mfr. Part No.XR16L788CQ-F
BrandMaxLinear
TWD1,171.80
Each (In a Tray of 66)
units
8 IrDA 64B 64B 6.25Mbit/s Yes Surface Mount PQFP 100 2.97 → 5.5 V 20.1 x 14.1 x 3.05mm - - -
RS Stock No. 888-8722
Mfr. Part No.FT231XS-U
BrandFTDI Chip
TWD54.60
Each (In a Pack of 1160)
units
- - - - - - Surface Mount SSOP 20 - 8.74 x 3.99 x 1.5mm - - -
RS Stock No. 686-5926
Mfr. Part No.ST16C550CQ48-F
BrandMaxLinear
TWD167.00
Each
units
1 - 16B 16B 1.5Mbit/s Yes Surface Mount TQFP 48 2.97 → 5.5 V 7.1 x 7.1 x 1.05mm - - -