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. 730-0168
Mfr. Part No.FT232RQ-REEL
BrandFTDI Chip
kr 41,18
Each
Units
1 RS232, RS422, RS485 UART 256B 128B 3MBd - Surface Mount QFN 32 5 V 5 x 5mm 5mm 5mm -
RS Stock No. 170-9073
Mfr. Part No.FT232RQ-REEL
BrandFTDI Chip
kr 21,627
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. 888-8729
Mfr. Part No.FT231XQ-T
BrandFTDI Chip
kr 18,783
Each (In a Pack of 10)
Units
- - - - - - Surface Mount QFN 20 - 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 531-2522
Mfr. Part No.TL16C554APN
kr 94,42
Each
Units
4 - 16B 16B 1MBd Yes Surface Mount LQFP 80 5 V 12 x 12 x 1.4mm 12mm 12mm 1.4mm
RS Stock No. 757-0045
Mfr. Part No.FT231XQ-R
BrandFTDI Chip
kr 19,44
Each (In a Pack of 2)
Units
- - - - - - - - - - - - - -
RS Stock No. 121-8680
Mfr. Part No.TL16C554APN
kr 67,757
Each (In a Tray of 119)
Units
4 - 16B 16B 1MBd Yes Surface Mount LQFP 80 5 V 12 x 12 x 1.4mm 12mm 12mm 1.4mm
RS Stock No. 622-7964
Mfr. Part No.MAX3100CEE+
kr 46,36
Each
Units
1 IrDA 16B 16B 0.23MBd - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.55mm 4.98mm 3.99mm 1.55mm
RS Stock No. 757-0032
Mfr. Part No.FT231XS-R
BrandFTDI Chip
kr 19,44
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. 888-8722
Mfr. Part No.FT231XS-U
BrandFTDI Chip
kr 14,426
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. 923-1613
Mfr. Part No.FT231XQ-R
BrandFTDI Chip
kr 14,11
Each (On a Reel of 5000)
Units
- - - - - - - - - - - - - -
RS Stock No. 923-1584
Mfr. Part No.FT232HL-REEL
BrandFTDI Chip
kr 25,212
Each (On a Reel of 1500)
Units
1 RS232, RS422, RS485 UART - - 12Mbit/s - Surface Mount LQFP 48 1.8 V, 3.3 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 923-1607
Mfr. Part No.FT231XS-R
BrandFTDI Chip
kr 14,11
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. 737-7843
Mfr. Part No.FT232HL-REEL
BrandFTDI Chip
kr 38,98
Each
Units
1 RS232, RS422, RS485 UART - - 12Mbit/s - Surface Mount LQFP 48 1.8 V, 3.3 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 733-6381
Mfr. Part No.XR16M890IL32-F
BrandEXAR
kr 34,20
Each
Units
1 RS232, RS422, RS485 UART 128B 128B 24Mbit/s Yes Surface Mount QFN 32 1.8 V, 2.5 V, 3.3 V 5 x 5 x 0.88mm 5mm 5mm 0.88mm
RS Stock No. 686-6023
Mfr. Part No.XR17V258IV-F
BrandEXAR
kr 346,36
Each
Units
8 IrDA 64B 64B 8Mbit/s Yes Surface Mount LQFP 144 3.3 V 20.1 x 20.1 x 1.45mm 20.1mm 20.1mm 1.45mm
RS Stock No. 190-1375
Mfr. Part No.MAX3109ETJ+
kr 65,80
Each (In a Pack of 2)
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. 797-4759
Mfr. Part No.SC16C654DBIB64,151
BrandNXP
kr 97,91
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. 847-2908
Mfr. Part No.XR16C850CM-F
BrandEXAR
kr 107,88
Each
Units
1 IrDA, RS232, RS422, RS485 - - 2Mbit/s Yes Surface Mount TQFP 48 3.3 V, 5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
RS Stock No. 170-4466
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
kr 34,297
Each (In a Tray of 490)
Units
- - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm 5mm 5mm 0.88mm
RS Stock No. 162-7083
Mfr. Part No.TL16C550CPTR
kr 22,654
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
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