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. 182-2508
Mfr. Part No.TL16C450FN
€4.37
Each
units
1 - - - 0.256Mbit/s - Surface Mount PLCC 44 5 V 16.59 x 16.59 x 4.06mm - - -
RS Stock No. 189-7774
Mfr. Part No.MAX3107ETG+
€5.173
Each (In a Tube of 86)
units
1 RS232, RS485 - - 24Mbps Yes Surface Mount TQFN 24 2.35 → 3.6 V 3.6 x 3.6 x 0.75mm - - -
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. 757-0017
Mfr. Part No.FT200XD-R
BrandFTDI Chip
€1.825
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. 662-3911
Mfr. Part No.TL16C452FNR
€6.14
Each
units
2 - - - 0.256Mbit/s - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm - - -
RS Stock No. 923-1581
Mfr. Part No.FT230XS-R
BrandFTDI Chip
€1.42
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. 170-4457
Mfr. Part No.XR17V258IV-F
BrandEXAR
€31.017
Each (In a Tube of 60)
units
8 IrDA 64B 64B 8Mbit/s Yes Surface Mount LQFP 144 3.3 V 20.1 x 20.1 x 1.45mm - - -
RS Stock No. 203-5826
Mfr. Part No.MAX17841BGUE/V+
€5.261
Each (In a Tube of 96)
units
1 UART - - 2Mbps - - TSSOP 16 3.1 → 3.5 V - - - -
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. 170-9070
Mfr. Part No.FT2232HL
BrandFTDI Chip
€4.898
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. 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 - - -
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. 170-4469
Mfr. Part No.XR21V1414IM48-F
BrandEXAR
€5.497
Each (In a Tray of 250)
units
4 - - - - - Surface Mount TQFP 48 - 7 x 7 x 1mm - - -
RS Stock No. 923-1600
Mfr. Part No.FT221XS-R
BrandFTDI Chip
€1.523
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. 190-1312
Mfr. Part No.MAX3100EEE+
€6.91
Each (In a Pack of 2)
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. 170-4580
Mfr. Part No.XR16C850CM-F
BrandEXAR
€8.56
Each (In a Tray of 250)
units
1 IrDA, RS232, RS422, RS485 - - 2Mbit/s Yes Surface Mount TQFP 48 3.3 V, 5 V 7.1 x 7.1 x 1.05mm - - -
RS Stock No. 170-4455
Mfr. Part No.XR17D152CM-F
BrandEXAR
€17.555
Each (In a Tube of 90)
units
2 RS232, RS422, RS485 64B 64B 6.25Mbit/s Yes Surface Mount TQFP 100 5 V 14.1 x 14.1 x 1.05mm - - -
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. 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 - - -