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. 686-6055
Mfr. Part No.XR82C684CJ/44-F
BrandMaxLinear
HK$145.33
Each
units
4 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 913-4250
Mfr. Part No.XR82C684CJ/44-F
BrandMaxLinear
HK$127.71
Each (In a Tube of 27)
units
4 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 923-1597
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
HK$11.381
Each (On a Reel of 5000)
units
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount QFN 16 5 V 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 888-8716
Mfr. Part No.FT230XQ-T
BrandFTDI Chip
HK$16.587
Each (In a Pack of 10)
units
- - - - - - Surface Mount QFN 16 - 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 757-0026
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
HK$17.985
Each (In a Pack of 2)
units
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount QFN 16 5 V 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 730-0168
Mfr. Part No.FT232RQ-REEL
BrandFTDI Chip
HK$39.67
Each
units
1 RS232, RS422, RS485 UART 256B 128B 3MBd - Surface Mount QFN 32 5 V 5 x 5mm 5mm 5mm -
RS Stock No. 913-4256
Mfr. Part No.XR16L788IQ-F
BrandMaxLinear
HK$276.751
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. 686-5888
Mfr. Part No.ST16C2550CQ48-F
BrandMaxLinear
HK$54.82
Each
units
2 RS232, RS485 16B 16B 4Mbit/s Yes Surface Mount TQFP 48 2.97 → 5.5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
RS Stock No. 200-1782
Mfr. Part No.FT232HL-TRAY
BrandFTDI Chip
HK$28.026
Each (In a Tray of 250)
units
1 - - - 12Mbps - - LQFP 48 2.97 V - - - -
RS Stock No. 165-9562
Mfr. Part No.MAX3100CPD+
HK$54.209
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 19.43mm 7.87mm 4.45mm
RS Stock No. 170-4542
Mfr. Part No.XR16V554DIV-F
BrandEXAR
HK$80.206
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. 170-4514
Mfr. Part No.ST16C654IJ68-F
BrandEXAR
HK$133.972
Each (In a Tube of 19)
units
4 IrDA, RS232, RS422, RS485 64B 64B 1.5Mbit/s - Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 5.08mm 24.33mm 24.33mm 5.08mm
RS Stock No. 700-4380
Mfr. Part No.XR21V1414IM48-F
BrandEXAR
HK$59.99
Each
units
4 - - - - - Surface Mount TQFP 48 - 7 x 7 x 1mm 7mm 7mm 1mm
RS Stock No. 200-1783
Mfr. Part No.FT232HL-TRAY
BrandFTDI Chip
HK$37.46
Each (In a Pack of 2)
units
1 - - - 12Mbps - - LQFP 48 2.97 V - - - -
RS Stock No. 162-7082
Mfr. Part No.TL16C452FNR
HK$36.575
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 24.23mm 24.23mm 4.06mm
RS Stock No. 923-1607
Mfr. Part No.FT231XS-R
BrandFTDI Chip
HK$13.567
Each (On a Reel of 2000)
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. 757-0045
Mfr. Part No.FT231XQ-R
BrandFTDI Chip
HK$15.765
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS Stock No. 162-7083
Mfr. Part No.TL16C550CPTR
HK$18.509
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 7mm 7mm 1.4mm
RS Stock No. 686-6067
Mfr. Part No.XR88C681CJ-F
BrandMaxLinear
HK$67.69
Each
units
2 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 686-5913
Mfr. Part No.ST16C550CJ44-F
BrandMaxLinear
HK$34.37
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 16.66mm 16.66mm 3.68mm
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