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
MYR7.876
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
MYR8.039
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
MYR9.375
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. 162-4339
Mfr. Part No.TL16C450FN
MYR16.93
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. 170-9070
Mfr. Part No.FT2232HL
BrandFTDI Chip
MYR27.548
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. 923-1616
Mfr. Part No.FT240XQ-R
BrandFTDI Chip
MYR8.331
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 - - -
RS Stock No. 687-7720
Mfr. Part No.FT2232HL
BrandFTDI Chip
MYR28.87
Each
units
2 RS232, RS422, RS485 - - 480Mbit/s - Surface Mount LQFP 64 - 10 x 10 x 1.4mm - - -
RS Stock No. 923-1581
Mfr. Part No.FT230XS-R
BrandFTDI Chip
MYR7.612
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
MYR9.025
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. 757-0051
Mfr. Part No.FT240XQ-R
BrandFTDI Chip
MYR8.83
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 - - -
RS Stock No. 182-2508
Mfr. Part No.TL16C450FN
MYR18.81
Each
units
1 - - - 0.256Mbit/s - Surface Mount PLCC 44 5 V 16.59 x 16.59 x 4.06mm - - -
RS Stock No. 816-0239
Mfr. Part No.SC16IS762IPW,112
BrandNXP
MYR22.31
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. 162-7082
Mfr. Part No.TL16C452FNR
MYR18.748
Each (On a Reel of 250)
units
2 - - - 0.256Mbit/s - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm - - -
RS Stock No. 700-4371
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
MYR31.63
Each
units
2 - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm - - -
RS Stock No. 170-4518
Mfr. Part No.XR88C681J-F
BrandEXAR
MYR32.02
Each (In a Tube of 27)
units
2 RS232, RS422, RS485 1B 3B 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 4.57mm - - -
RS Stock No. 913-4250
Mfr. Part No.XR82C684CJ/44-F
BrandMaxLinear
MYR73.284
Each (In a Tube of 27)
units
4 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm - - -
RS Stock No. 170-4459
Mfr. Part No.XR88C681CJ-F
BrandEXAR
MYR25.97
Each (In a Tube of 27)
units
2 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm - - -
RS Stock No. 888-8716
Mfr. Part No.FT230XQ-T
BrandFTDI Chip
MYR8.34
Each (In a Pack of 10)
units
- - - - - - Surface Mount QFN 16 - 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 797-4759
Mfr. Part No.SC16C654DBIB64,151
BrandNXP
MYR47.26
Each
units
4 UART 64B 64B 5Mbit/s Yes Surface Mount LQFP 64 2.5 V, 3.3 V, 5 V 10.1 x 10.1 x 1.45mm - - -
RS Stock No. 173-0790
Mfr. Part No.XR20M1170IG16-F
BrandEXAR
MYR13.623
Each (In a Tube of 95)
units
1 IrDA, RS232, RS422, RS485 64B 64B 16Mbit/s Yes Surface Mount TSSOP 16 1.6 → 3.6 V 5.1 x 4.5 x 0.95mm - - -