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. 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. 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. 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. 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. 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. 737-7852
Mfr. Part No.FT232HQ-REEL
BrandFTDI Chip
HK$37.46
Each
units
1 RS232, RS422, RS485 UART - - 12Mbit/s - Surface Mount QFN 48 1.8 V, 3.3 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 757-0017
Mfr. Part No.FT200XD-R
BrandFTDI Chip
HK$16.255
Each (In a Pack of 2)
units
1 SIE, UART 512B 512B 3.4Mbit/s Yes Surface Mount DFN 10 5 V 3 x 3 x 0.75mm 3mm 3mm 0.75mm
RS Stock No. 923-1613
Mfr. Part No.FT231XQ-R
BrandFTDI Chip
HK$11.628
Each (On a Reel of 5000)
units
- - - - - - - - - - - - - -
RS Stock No. 170-9073
Mfr. Part No.FT232RQ-REEL
BrandFTDI Chip
HK$19.105
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. 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. 757-0023
Mfr. Part No.FT201XS-R
BrandFTDI Chip
HK$17.46
Each (In a Pack of 2)
units
1 SIE, UART 512B 512B 3.4Mbit/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
HK$13.09
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. 923-1587
Mfr. Part No.FT232HQ-REEL
BrandFTDI Chip
HK$25.915
Each (On a Reel of 3000)
units
1 RS232, RS422, RS485 UART - - 12Mbit/s - Surface Mount QFN 48 1.8 V, 3.3 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 200-1778
Mfr. Part No.FT230XQ-T
BrandFTDI Chip
HK$17.985
Each (In a Pack of 4)
units
1 RS232, RS422, RS485, SIE, UART - - 3Mbps - - QFN 16 5 V - - - -
RS Stock No. 923-1581
Mfr. Part No.FT230XS-R
BrandFTDI Chip
HK$11.381
Each (On a Reel of 3000)
units
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in 5mm 0.157in 1.5mm
RS Stock No. 200-1777
Mfr. Part No.FT230XQ-T
BrandFTDI Chip
HK$15.046
Each (In a Tray of 490)
units
1 RS232, RS422, RS485, SIE, UART - - 3Mbps - - QFN 16 5 V - - - -
RS Stock No. 170-9074
Mfr. Part No.FT220XS-R
BrandFTDI Chip
HK$12.782
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. 757-0036
Mfr. Part No.FT221XS-R
BrandFTDI Chip
HK$23.36
Each (In a Pack of 2)
units
1 SIE, UART 512B 512B 1Mbit/s Yes Surface Mount SSOP 20 5 V 0.344 x 0.157 x 0.059in 8.74mm 0.157in 1.5mm
RS Stock No. 923-1600
Mfr. Part No.FT221XS-R
BrandFTDI Chip
HK$13.133
Each (On a Reel of 3000)
units
1 SIE, UART 512B 512B 1Mbit/s Yes Surface Mount SSOP 20 5 V 0.344 x 0.157 x 0.059in 8.74mm 0.157in 1.5mm