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. 162-4339
Mfr. Part No.TL16C450FN
SGD3.832
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 16.59mm 16.59mm 4.06mm
RS Stock No. 732-9143
Mfr. Part No.MAX3111EEWI+G36
BrandMaxim
SGD25.36
Each
units
2 RS232, UART - - 0.25Mbit/s - Surface Mount SOIC W 28 3.3 V 18.1 x 7.6 x 2.35mm 18.1mm 7.6mm 2.35mm
RS Stock No. 923-1597
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
SGD2.267
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. 165-9901
Mfr. Part No.SC16C554BIB80,551
BrandNXP
SGD15.605
Each (In a Tray of 119)
units
4 UART 16B 16B 5Mbit/s Yes Surface Mount LQFP 80 2.5 V, 3.3 V, 5 V 12.1 x 12.1 x 1.5mm 12.1mm 12.1mm 1.5mm
RS Stock No. 913-4216
Mfr. Part No.ST16C2550CJ44-F
BrandEXAR
SGD9.222
Each (In a Tube of 27)
units
2 RS232, RS485 16B 16B 4Mbit/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
RS Stock No. 165-9559
Mfr. Part No.MAX3109ETJ+
BrandMaxim
SGD18.96
Each (In a Tube of 60)
units
1 RS232, RS485 - - 24Mbit/s Yes Surface Mount TQFN 32 1.71 → 3.6 V 5.0 x 5.0 x 0.43mm 5mm 5.0mm 0.43mm
RS Stock No. 757-0032
Mfr. Part No.FT231XS-R
BrandFTDI Chip
SGD3.255
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. 797-4743
Mfr. Part No.SC16C554BIB80
BrandNXP
SGD17.70
Each
units
4 UART 16B 16B 5Mbit/s Yes Surface Mount LQFP 80 2.5 V, 3.3 V, 5 V 12.1 x 12.1 x 1.5mm 12.1mm 12.1mm 1.5mm
RS Stock No. 162-7082
Mfr. Part No.TL16C452FNR
SGD5.303
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. 170-9070
Mfr. Part No.FT2232HL
BrandFTDI Chip
SGD7.762
Each (On a Reel of 1000)
units
2 RS232, RS422, RS485 - - 480Mbit/s - Surface Mount LQFP 64 - 10 x 10 x 1.4mm 10mm 10mm 1.4mm
RS Stock No. 799-2849
Mfr. Part No.MAX3109ETJ+
BrandMaxim
SGD17.62
Each
units
1 RS232, RS485 - - 24Mbit/s Yes Surface Mount TQFN 32 1.71 to 3.6 V 5.0 x 5.0 x 0.43mm 5mm 5.0mm 0.43mm
RS Stock No. 686-5884
Mfr. Part No.ST16C2550CJ44-F
BrandEXAR
SGD6.64
Each
units
2 RS232, RS485 16B 16B 4Mbit/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
RS Stock No. 797-4759
Mfr. Part No.SC16C654DBIB64,151
BrandNXP
SGD15.14
Each
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 10.1mm 10.1mm 1.45mm
RS Stock No. 686-5932
Mfr. Part No.ST16C550IQ48-F
BrandEXAR
SGD4.59
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 7.1mm 7.1mm 1.05mm
RS Stock No. 923-7661
Mfr. Part No.MAX14830ETM+
BrandMaxim
SGD25.833
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. 686-5995
Mfr. Part No.XR16L788CQ-F
BrandEXAR
SGD34.93
Each
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. 162-7081
Mfr. Part No.TL16C2550PFB
SGD7.42
Each (In a Tray of 250)
units
2 - 16B 16B 1.5MBd Yes Surface Mount TQFP 48 5 V 7 x 7 x 1mm 7mm 7mm 1mm
RS Stock No. 546-1472
Mfr. Part No.TL16C552FN
SGD16.10
Each
units
2 - 16B 16B 1Mbit/s - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 346-6891
Mfr. Part No.TL16C554FN
SGD17.65
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. 124-2426
Mfr. Part No.SC28L92A1B,551
BrandNXP
SGD12.426
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
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