Universal Asynchronous Receivers & Transmitters

Universal Asynchronous Receiver-Transmitter, more commonly referred to as UART, is a type of serial communication interface. UART’s 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
BrandEXAR
HK$141.60
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
BrandEXAR
HK$127.87
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. 786-0907
Mfr. Part No.MAX14830ETM+
BrandMaxim
HK$182.91
Each
units
4 RS485 - - 24MBd - Surface Mount TQFN 48 2.35 → 3.6 V 7.1 x 7.1 x 0.75mm 7.1mm 7.1mm 0.75mm
RS Stock No. 923-7661
Mfr. Part No.MAX14830ETM+
BrandMaxim
HK$147.964
Each (In a Tube of 43)
units
4 RS485 - - 24MBd - Surface Mount TQFN 48 2.35 → 3.6 V 7.1 x 7.1 x 0.75mm 7.1mm 7.1mm 0.75mm
RS Stock No. 923-1597
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
HK$13.817
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$13.585
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$18.29
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. 662-3946
Mfr. Part No.TL16C554FNR
HK$73.71
Each
units
4 - 16B 16B 1MBd Yes Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 162-7086
Mfr. Part No.TL16C554FNR
HK$92.767
Each (On a Reel of 250)
units
4 - 16B 16B 1MBd Yes Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 170-4513
Mfr. Part No.ST16C654DIQ64-F
BrandEXAR
HK$134.735
Each (In a Tray of 160)
units
4 IrDA, RS232, RS422, RS485 64B 64B 1.5Mbit/s - Surface Mount LQFP 64 2.97 → 5.5 V 10 x 10 x 1.4mm 10mm 10mm 1.4mm
RS Stock No. 686-5957
Mfr. Part No.ST16C554DIQ64-F
BrandEXAR
HK$99.80
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 10.1mm 10.1mm 1.45mm
RS Stock No. 170-4514
Mfr. Part No.ST16C654IJ68-F
BrandEXAR
HK$142.223
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. 170-9074
Mfr. Part No.FT220XS-R
BrandFTDI Chip
HK$17.13
Each (On a Reel of 3000)
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. 170-4515
Mfr. Part No.XR16C854IQ-F
BrandEXAR
HK$214.056
Each (In a Tube of 66)
units
4 IrDA, RS232, RS422, RS485 128B 128B 2Mbit/s Yes Surface Mount QFP 100 2.97 → 5.5 V 20.1 x 14.1 x 3.05mm 20.1mm 14.1mm 3.05mm
RS Stock No. 170-4467
Mfr. Part No.XR17V358IB176-F
BrandEXAR
HK$165.017
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 13.1mm 13.1mm 1.15mm
RS Stock No. 121-8987
Mfr. Part No.PC16552DV/NOPB
HK$71.213
Each (In a Tube of 25)
units
2 - 16B 16B 1.5MBd Yes Surface Mount PLCC 44 5 V 16.51 x 16.51 x 3.68mm 16.51mm 16.51mm 3.68mm
RS Stock No. 686-6005
Mfr. Part No.XR17D152CM-F
BrandEXAR
HK$136.97
Each
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. 757-0045
Mfr. Part No.FT231XQ-R
BrandFTDI Chip
HK$17.42
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS Stock No. 769-5608
Mfr. Part No.XR20M1172IG28-F
BrandEXAR
HK$51.00
Each
units
2 IrDA, RS232, RS422, RS485 64B 64B 16Mbit/s Yes Surface Mount TSSOP 28 1.6 → 3.6 V 9.8 x 4.5 x 1.05mm 9.8mm 4.5mm 1.05mm
RS Stock No. 769-5620
Mfr. Part No.XR88C681J-F
BrandEXAR
HK$77.63
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
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