Universal Asynchronous Receivers & Transmitters

Universal Asynchronous Receiver-Transmitter, more commonly referred to as UART, is a type of serial communication interface. UARTs primary function is 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.

These particular UARTs are stand-alone integrated circuits (ICs). However, you can also find UARTs within microcontrollers (MCUs).

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).

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.

What does Asynchronous mean?

Asynchronous is a type of serial communication where the interfaces at each end are not synchronised by a common clock signal.

What is USART?

USART is very similar in functionality to a UART device. However, it also offers the possibility of a synchronous mode.


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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. 913-4256
Mfr. Part No.XR16L788IQ-F
BrandMaxLinear
€21.009
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 20.1mm 14.1mm 3.05mm
RS Stock No. 923-1613
Mfr. Part No.FT231XQ-R
BrandFTDI Chip
€1.415
Each (On a Reel of 5000)
units
- - - - - - - - - - - - - -
RS Stock No. 121-8680
Mfr. Part No.TL16C554APN
€6.796
Each (In a Tray of 119)
units
4 - 16B 16B 1MBd Yes Surface Mount LQFP 80 5 V 12 x 12 x 1.4mm 12mm 12mm 1.4mm
RS Stock No. 124-2426
Mfr. Part No.SC28L92A1B,551
BrandNXP
€7.797
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 10mm 10mm 1.75mm
New
RS Stock No. 200-1783
Mfr. Part No.FT232HL-TRAY
BrandFTDI Chip
€3.705
Each (In a Pack of 2)
units
1 - - - 12Mbps - - LQFP 48 2.97 V - - - -
RS Stock No. 700-4377
Mfr. Part No.XR21V1410IL16-F
BrandEXAR
€3.41
Each
units
- - - - - - Surface Mount QFN 16 - 3 x 3 x 0.88mm 3mm 3mm 0.88mm
RS Stock No. 757-0014
Mfr. Part No.FT220XS-R
BrandFTDI Chip
€1.88
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 5mm 0.157in 1.5mm
RS Stock No. 888-8722
Mfr. Part No.FT231XS-U
BrandFTDI Chip
€1.447
Each (In a Pack of 1160)
units
- - - - - - Surface Mount SSOP 20 - 8.74 x 3.99 x 1.5mm 8.74mm 3.99mm 1.5mm
New
RS Stock No. 200-1778
Mfr. Part No.FT230XQ-T
BrandFTDI Chip
€1.775
Each (In a Pack of 4)
units
1 RS232, RS422, RS485, SIE, UART - - 3Mbps - - QFN 16 5 V - - - -
RS Stock No. 686-5941
Mfr. Part No.ST16C554DCJ68-F
BrandEXAR
€8.06
Each
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm 24.33mm 24.33mm 3.68mm
RS Stock No. 757-0032
Mfr. Part No.FT231XS-R
BrandFTDI Chip
€1.95
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 8.74mm 0.157in 1.5mm
RS Stock No. 170-4554
Mfr. Part No.XR28V382IL32-F
BrandEXAR
€2.963
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 5mm 5mm 0.95mm
RS Stock No. 737-7843
Mfr. Part No.FT232HL-REEL
BrandFTDI Chip
€3.91
Each
units
1 RS232, RS422, RS485 UART - - 12Mbit/s - Surface Mount LQFP 48 1.8 V, 3.3 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 769-5620
Mfr. Part No.XR88C681J-F
BrandEXAR
€8.58
Each
units
2 RS232, RS422, RS485 1B 3B 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 4.57mm 16.66mm 16.66mm 4.57mm
RS Stock No. 162-7085
Mfr. Part No.TL16C554AIPN
€5.485
Each (In a Tube of 119)
units
4 - 16B 16B 1MBd Yes Surface Mount LQFP 80 5 V 12 x 12 x 1.4mm 12mm 12mm 1.4mm
RS Stock No. 170-4448
Mfr. Part No.ST16C552CJ68-F
BrandEXAR
€6.172
Each (In a Tube of 19)
units
2 - 16B 16B 1.5Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm 24.33mm 24.33mm 3.68mm
RS Stock No. 769-5605
Mfr. Part No.XR20M1170IG16-F
BrandEXAR
€3.04
Each (In a Pack of 2)
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 5.1mm 4.5mm 0.95mm
RS Stock No. 170-4542
Mfr. Part No.XR16V554DIV-F
BrandEXAR
€7.375
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 10.1mm 10.1mm 1.45mm
RS Stock No. 170-4455
Mfr. Part No.XR17D152CM-F
BrandEXAR
€16.678
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 14.1mm 14.1mm 1.05mm
RS Stock No. 797-4737
Mfr. Part No.SC16C2550BIB48,151
BrandNXP
€3.92
Each
units
2 UART 16B 16B 5Mbit/s Yes Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7.1 x 7.1 x 1.6mm 7.1mm 7.1mm 1.6mm
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