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. 686-5932
Mfr. Part No.ST16C550IQ48-F
BrandMaxLinear
HK$47.42
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. 170-4454
Mfr. Part No.XR16C2850CM-F
BrandEXAR
HK$98.515
Each (In a Tray of 250)
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 7.1mm 7.1mm 1.05mm
RS Stock No. 686-5951
Mfr. Part No.ST16C650ACQ48-F
BrandMaxLinear
HK$65.57
Each
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 7.1mm 7.1mm 1.05mm
RS Stock No. 200-1781
Mfr. Part No.FT230XS-U
BrandFTDI Chip
HK$17.985
Each (In a Pack of 4)
units
1 RS232, RS422, RS485, SIE, UART - - 3Mbps - - SSOP 16 5 V - - - -
RS Stock No. 200-1779
Mfr. Part No.FT230XS-U
BrandFTDI Chip
HK$19.26
Each (In a Tube of 100)
units
1 RS232, RS422, RS485, SIE, UART - - 3Mbps - - SSOP 16 5 V - - - -
RS Stock No. 178-9093
Mfr. Part No.TL16C550CFNR
HK$56.905
Each (In a Tube of 26)
units
1 - 16B 16B 1MBd Yes Surface Mount PLCC 44 3 → 5.25 V 16.59 x 16.59 x 4.06mm 16.59mm 16.59mm 4.06mm
RS Stock No. 170-9073
Mfr. Part No.FT232RQ-REEL
BrandFTDI Chip
HK$23.82
Each (On a Reel of 6000)
units
1 RS232, RS422, RS485 UART 256B 128B 3MBd - Surface Mount QFN 32 5 V 5 x 5mm 5mm 5mm -
RS Stock No. 190-6193
Mfr. Part No.MAX3100CEE+T
HK$43.376
Each (On a Reel of 2500)
units
1 IrDA, RS232, RS485 - - - - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.65mm 4.98mm 3.99mm 1.65mm
RS Stock No. 797-4737
Mfr. Part No.SC16C2550BIB48,151
BrandNXP
HK$52.71
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
RS Stock No. 170-4468
Mfr. Part No.XR21V1410IL16-F
BrandEXAR
HK$23.714
Each (In a Tray of 490)
units
1 - - - - - Surface Mount QFN 16 - 3 x 3 x 0.88mm 3mm 3mm 0.88mm
RS Stock No. 170-4518
Mfr. Part No.XR88C681J-F
BrandEXAR
HK$64.777
Each (In a Tube of 27)
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. 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. 686-5890
Mfr. Part No.ST16C2550IQ48-F
BrandMaxLinear
HK$73.42
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. 888-8722
Mfr. Part No.FT231XS-U
BrandFTDI Chip
HK$13.313
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
RS Stock No. 165-9908
Mfr. Part No.SC16C752BIB48,151
BrandNXP
HK$33.96
Each (In a Tray of 250)
units
2 UART 64B 64B 5Mbit/s Yes Surface Mount LQFP 48 2.2 V, 2.5 V, 5 V 7.1 x 7.1 x 1.45mm 7.1mm 7.1mm 1.45mm
RS Stock No. 189-7773
Mfr. Part No.MAX3107EAG+
HK$60.919
Each (In a Tube of 58)
units
1 RS232, RS485 - - 24Mbps Yes Surface Mount SSOP 24 2.35 → 3.6 V 8.33 x 5.38 x 1.78mm 8.33mm 5.38mm 1.78mm
RS Stock No. 484-1445
Mfr. Part No.SC28L92A1B,551
BrandNXP
HK$101.79
Each
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
RS Stock No. 769-5563
Mfr. Part No.ST16C654IJ68-F
BrandMaxLinear
HK$145.33
Each
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. 121-8491
Mfr. Part No.TL16C452FN
HK$64.259
Each (In a Tube of 18)
units
- - - - - - - - - - - - - -
RS Stock No. 778-0898
Mfr. Part No.XR16V554DIV-F
BrandMaxLinear
HK$111.14
Each
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
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