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. 923-1607
Mfr. Part No.FT231XS-R
BrandFTDI Chip
PHP99.121
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. 888-8722
Mfr. Part No.FT231XS-U
BrandFTDI Chip
PHP96.726
Each (In a Pack of 1160)
units
- - - - - - Surface Mount SSOP 20 - 8.74 x 3.99 x 1.5mm - - -
RS Stock No. 757-0032
Mfr. Part No.FT231XS-R
BrandFTDI Chip
PHP114.22
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. 687-7720
Mfr. Part No.FT2232HL
BrandFTDI Chip
PHP428.73
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
PHP357.585
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. 757-0036
Mfr. Part No.FT221XS-R
BrandFTDI Chip
PHP183.615
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. 923-1600
Mfr. Part No.FT221XS-R
BrandFTDI Chip
PHP103.076
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. 797-4737
Mfr. Part No.SC16C2550BIB48,151
BrandNXP
PHP410.03
Each
units
2 UART 16B 16B 5Mbit/s Yes Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7.1 x 7.1 x 1.6mm - - -
RS Stock No. 124-2420
Mfr. Part No.SC16C2550BIB48,151
BrandNXP
PHP278.859
Each (In a Tray of 250)
units
2 UART 16B 16B 5Mbit/s Yes Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7.1 x 7.1 x 1.6mm - - -
RS Stock No. 686-5932
Mfr. Part No.ST16C550IQ48-F
BrandMaxLinear
PHP312.90
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 - - -
RS Stock No. 686-6067
Mfr. Part No.XR88C681CJ-F
BrandMaxLinear
PHP474.37
Each
units
2 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm - - -
RS Stock No. 162-4339
Mfr. Part No.TL16C450FN
PHP217.35
Each (In a Tube of 26)
units
1 - - - 0.256Mbit/s - Surface Mount PLCC 44 5 V 16.59 x 16.59 x 4.06mm - - -
RS Stock No. 203-5826
Mfr. Part No.MAX17841BGUE/V+
PHP319.179
Each (In a Tube of 96)
units
1 UART - - 2Mbps - - TSSOP 16 3.1 → 3.5 V - - - -
RS Stock No. 686-5904
Mfr. Part No.ST16C2552CJ44TR-F
BrandMaxLinear
PHP325.16
Each
units
2 RS232, RS485 16B 16B 4Mbit/s Yes Surface Mount PLCC 44 2.97 → 5.5 V 16.66 x 16.66 x 3.68mm - - -
RS Stock No. 923-1590
Mfr. Part No.FT200XD-R
BrandFTDI Chip
PHP93.845
Each (On a Reel of 5000)
units
1 SIE, UART 512B 512B 3.4Mbit/s Yes Surface Mount DFN 10 5 V 3 x 3 x 0.75mm - - -
RS Stock No. 811-2971
Mfr. Part No.XR28V382IL32-F
BrandMaxLinear
PHP284.52
Each
units
2 IrDA, RS232, RS485 128B 128B 3Mbit/s Yes Surface Mount QFN 32 3.3 V 5 x 5 x 0.95mm - - -
RS Stock No. 757-0017
Mfr. Part No.FT200XD-R
BrandFTDI Chip
PHP108.045
Each (In a Pack of 2)
units
1 SIE, UART 512B 512B 3.4Mbit/s Yes Surface Mount DFN 10 5 V 3 x 3 x 0.75mm - - -
RS Stock No. 686-6001
Mfr. Part No.XR16L788IQ-F
BrandMaxLinear
PHP1,832.65
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. 700-4377
Mfr. Part No.XR21V1410IL16-F
BrandEXAR
PHP203.70
Each
units
1 - - - - - Surface Mount QFN 16 - 3 x 3 x 0.88mm - - -
RS Stock No. 700-4371
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
PHP398.22
Each
units
2 - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm - - -