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. 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. 162-4339
Mfr. Part No.TL16C450FN
€3.314
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. 203-5827
Mfr. Part No.MAX17841BGUE/V+
€6.73
Each
units
1 UART - - 2Mbps - - TSSOP 16 3.1 → 3.5 V - - - -
RS Stock No. 686-5932
Mfr. Part No.ST16C550IQ48-F
BrandMaxLinear
€5.10
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. 888-8722
Mfr. Part No.FT231XS-U
BrandFTDI Chip
€1.456
Each (In a Pack of 1160)
units
- - - - - - Surface Mount SSOP 20 - 8.74 x 3.99 x 1.5mm - - -
RS Stock No. 170-4469
Mfr. Part No.XR21V1414IM48-F
BrandEXAR
€4.997
Each (In a Tray of 250)
units
4 - - - - - Surface Mount TQFP 48 - 7 x 7 x 1mm - - -
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. 170-4457
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. 190-1375
Mfr. Part No.MAX3109ETJ+
€6.665
Each (In a Pack of 2)
units
1 RS232, RS485 - - 24Mbit/s Yes Surface Mount TQFN 32 1.71 → 3.6 V 5.0 x 5.0 x 0.43mm - - -
RS Stock No. 847-2908
Mfr. Part No.XR16C850CM-F
BrandMaxLinear
€11.18
Each
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. 686-5948
Mfr. Part No.ST16C554CQ64-F
BrandMaxLinear
€8.68
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. 124-2426
Mfr. Part No.SC28L92A1B,551
BrandNXP
€7.887
Each (In a Tray of 96)
units
2 - 16B 16B 0.23MBd - Surface Mount PQFP 44 2.97 → 5.5 V 10 x 10 x 1.75mm - - -
RS Stock No. 165-9902
Mfr. Part No.SC16C654DBIB64,151
BrandNXP
€5.333
Each (In a Tray of 160)
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. 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. 816-0239
Mfr. Part No.SC16IS762IPW,112
BrandNXP
€3.41
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 - - -
New
RS Stock No. 216-8422
Mfr. Part No.FT201XS-U
BrandFTDI Chip
€1.886
Each (In a Pack of 5)
units
- - 512B 512B 3.4Mbps - - SSOP 16 +3.3 → 5.25 V - - - -
RS Stock No. 170-4452
Mfr. Part No.ST16C650ACQ48-F
BrandEXAR
€6.203
Each (In a Tray of 250)
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 - - -
RS Stock No. 162-8368
Mfr. Part No.TIR1000PSR
€0.64
Each (On a Reel of 2000)
units
- - - - - - Surface Mount SOIC 8 - 6.5 x 5.6 x 1.85mm - - -
RS Stock No. 732-9140
Mfr. Part No.MAX3100CPD+
€6.06
Each
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. 686-5913
Mfr. Part No.ST16C550CJ44-F
BrandMaxLinear
€4.22
Each
units
1 - 16B 16B 1.5Mbit/s Yes Surface Mount PLCC 44 2.97 → 5.5 V 16.66 x 16.66 x 3.68mm - - -