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. 121-8491
Mfr. Part No.TL16C452FN
€5.884
Each (In a Tube of 18)
units
- - - - - - - - - - - - - -
RS Stock No. 170-4554
Mfr. Part No.XR28V382IL32-F
BrandEXAR
€3.193
Each (In a Tray of 490)
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. 923-1593
Mfr. Part No.FT201XS-R
BrandFTDI Chip
€1.47
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. 686-5951
Mfr. Part No.ST16C650ACQ48-F
BrandMaxLinear
€7.06
Each
units
1 IrDA 32B 32B 3.125Mbit/s Yes Surface Mount TQFP 48 2.9 → 5.5 V 7.1 x 7.1 x 1.05mm - - -
New
RS Stock No. 216-8416
Mfr. Part No.FT200XD-T
BrandFTDI Chip
€1.532
Each (In a Tray of 490)
units
- - 512B 512B 3.4Mbps - - DFN 10 +3.3 → 5.25 V - - - -
RS Stock No. 190-1333
Mfr. Part No.MAX3107EAG+
€6.995
Each (In a Pack of 2)
units
1 RS232, RS485 - - 24Mbps Yes Surface Mount SSOP 24 2.35 → 3.6 V 8.33 x 5.38 x 1.78mm - - -
RS Stock No. 913-4244
Mfr. Part No.XR16L788CQ-F
BrandMaxLinear
€20.52
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. 189-7772
Mfr. Part No.MAX3100EEE+
€6.204
Each (In a Tube of 100)
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. 913-4222
Mfr. Part No.ST16C2552CJ44TR-F
BrandMaxLinear
€3.74
Each (On a Reel of 500)
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. 797-4759
Mfr. Part No.SC16C654DBIB64,151
BrandNXP
€5.42
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. 778-0898
Mfr. Part No.XR16V554DIV-F
BrandMaxLinear
€11.97
Each
units
4 - 16B 16B 4Mbit/s - Surface Mount LQFP 64 2.25 → 3.6 V 10.1 x 10.1 x 1.45mm - - -
RS Stock No. 170-4468
Mfr. Part No.XR21V1410IL16-F
BrandEXAR
€1.267
Each (In a Tray of 490)
units
1 - - - - - Surface Mount QFN 16 - 3 x 3 x 0.88mm - - -
RS Stock No. 170-4466
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
€3.761
Each (In a Tray of 490)
units
2 - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm - - -
RS Stock No. 686-5963
Mfr. Part No.XR16C2850CM-F
BrandMaxLinear
€13.69
Each
units
2 IrDA 128B 128B 6.25Mbit/s Yes Surface Mount TQFP 48 2.97 → 5.5 V 7.1 x 7.1 x 1.05mm - - -
RS Stock No. 166-0323
Mfr. Part No.SC16C550BIB48,128
BrandNXP
€1.404
Each (On a Reel of 2000)
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. 170-4470
Mfr. Part No.XR16M890IL32-F
BrandEXAR
€2.743
Each (In a Tray of 490)
units
1 RS232, RS422, RS485 UART 128B 128B 24Mbit/s Yes Surface Mount QFN 32 1.8 V, 2.5 V, 3.3 V 5 x 5 x 0.88mm - - -
RS Stock No. 725-8846
Mfr. Part No.SC16IS752IPW,112
BrandNXP
€3.30
Each
units
2 IrDA 64B 64B 5Mbit/s - Surface Mount TSSOP 28 2.5 V, 3.3 V 9.8 x 4.5 x 0.75mm - - -
RS Stock No. 662-3915
Mfr. Part No.TL16C550CFNR
€4.632
Each (In a Pack of 5)
units
1 - 16B 16B 1MBd Yes Surface Mount PLCC 44 3 → 5.25 V 16.59 x 16.59 x 4.06mm - - -
RS Stock No. 170-4467
Mfr. Part No.XR17V358IB176-F
BrandEXAR
€12.38
Each (In a Tray of 160)
units
8 IrDA 256B 256B 25Mbit/s Yes Surface Mount FBGA 176 3.3 V 13.1 x 13.1 x 1.15mm - - -
RS Stock No. 170-4542
Mfr. Part No.XR16V554DIV-F
BrandEXAR
€7.763
Each (In a Tray of 160)
units
4 - 16B 16B 4Mbit/s - Surface Mount LQFP 64 2.25 → 3.6 V 10.1 x 10.1 x 1.45mm - - -