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. 170-4513
Mfr. Part No.ST16C654DIQ64-F
BrandEXAR
€12.489
Each (In a Tray of 160)
units
4 IrDA, RS232, RS422, RS485 64B 64B 1.5Mbit/s - Surface Mount LQFP 64 2.97 → 5.5 V 10 x 10 x 1.4mm - - -
RS Stock No. 769-5560
Mfr. Part No.ST16C654DIQ64-F
BrandMaxLinear
€14.86
Each
units
4 IrDA, RS232, RS422, RS485 64B 64B 1.5Mbit/s - Surface Mount LQFP 64 2.97 → 5.5 V 10 x 10 x 1.4mm - - -
RS Stock No. 923-1616
Mfr. Part No.FT240XQ-R
BrandFTDI Chip
€1.507
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. 757-0051
Mfr. Part No.FT240XQ-R
BrandFTDI Chip
€2.055
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. 162-7082
Mfr. Part No.TL16C452FNR
€3.856
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. 162-7083
Mfr. Part No.TL16C550CPTR
€2.392
Each (On a Reel of 1000)
units
1 - 16B 16B 1MBd Yes Surface Mount LQFP 48 3 → 5.25 V 7 x 7 x 1.4mm - - -
RS Stock No. 757-0014
Mfr. Part No.FT220XS-R
BrandFTDI Chip
€1.94
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. 686-6055
Mfr. Part No.XR82C684CJ/44-F
BrandMaxLinear
€15.65
Each
units
4 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm - - -
RS Stock No. 687-7720
Mfr. Part No.FT2232HL
BrandFTDI Chip
€5.87
Each
units
2 RS232, RS422, RS485 - - 480Mbit/s - Surface Mount LQFP 64 - 10 x 10 x 1.4mm - - -
RS Stock No. 165-9562
Mfr. Part No.MAX3100CPD+
€5.083
Each (In a Tube of 25)
units
1 IrDA 16B 16B 0.23MBd - Through Hole PDIP 14 3.3 V, 5 V 19.43 x 7.87 x 4.45mm - - -
RS Stock No. 700-4377
Mfr. Part No.XR21V1410IL16-F
BrandEXAR
€1.30
Each
units
1 - - - - - Surface Mount QFN 16 - 3 x 3 x 0.88mm - - -
RS Stock No. 190-1465
Mfr. Part No.MAX14830ETM+
€13.60
Each
units
4 RS485 - - 24MBd - Surface Mount TQFN 48 2.35 → 3.6 V 7.1 x 7.1 x 0.75mm - - -
New
RS Stock No. 216-8419
Mfr. Part No.FT201XQ-T
BrandFTDI Chip
€1.568
Each (In a Tray of 490)
units
- - 512B 512B 3.4Mbps - - QFN 16 +3.3 → 5.25 V - - - -
RS Stock No. 913-4301
Mfr. Part No.ST16C654IQ64-F
BrandMaxLinear
€10.723
Each (In a Tray of 160)
units
4 IrDA, RS232, RS422, RS485 64B 64B 1.5Mbit/s - Surface Mount LQFP 64 2.97 → 5.5 V 10 x 10 x 1.4mm - - -
RS Stock No. 170-9074
Mfr. Part No.FT220XS-R
BrandFTDI Chip
€1.47
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. 913-4234
Mfr. Part No.ST16C554DCQ64-F
BrandMaxLinear
€6.19
Each (In a Tray of 160)
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount LQFP 64 2.97 → 5.5 V 10.1 x 10.1 x 1.45mm - - -
RS Stock No. 725-8843
Mfr. Part No.SC16C550BIB48,128
BrandNXP
€2.41
Each
units
1 UART 16B 16B 3Mbit/s - Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7 x 7 x 1.4mm - - -
RS Stock No. 622-7964
Mfr. Part No.MAX3100CEE+
€4.41
Each
units
1 IrDA 16B 16B 0.23MBd - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.55mm - - -
RS Stock No. 686-5957
Mfr. Part No.ST16C554DIQ64-F
BrandMaxLinear
€10.13
Each
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount LQFP 64 2.97 → 5.5 V 10.1 x 10.1 x 1.45mm - - -
RS Stock No. 913-4256
Mfr. Part No.XR16L788IQ-F
BrandMaxLinear
€29.815
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 - - -