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. 170-9073
Mfr. Part No.FT232RQ-REEL
BrandFTDI Chip
€2.027
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
€3.89
Each
units
1 RS232, RS422, RS485 UART 256B 128B 3MBd - Surface Mount QFN 32 5 V 5 x 5mm 5mm 5mm -
RS Stock No. 170-4513
Mfr. Part No.ST16C654DIQ64-F
BrandEXAR
€11.865
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. 769-5560
Mfr. Part No.ST16C654DIQ64-F
BrandMaxLinear
€15.14
Each
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. 757-0051
Mfr. Part No.FT240XQ-R
BrandFTDI Chip
€1.87
Each (In a Pack of 2)
units
1 SIE 512B 512B 1Mbit/s Yes Surface Mount QFN 24 5 V 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 923-1616
Mfr. Part No.FT240XQ-R
BrandFTDI Chip
€1.37
Each (On a Reel of 5000)
units
1 SIE 512B 512B 1Mbit/s Yes Surface Mount QFN 24 5 V 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 686-5904
Mfr. Part No.ST16C2552CJ44TR-F
BrandMaxLinear
€5.18
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. 786-1001
Mfr. Part No.MAX3140CEI+
€7.02
Each
units
1 RS422, RS485 - - 230kBd - Surface Mount QSOP 28 4.75 → 5.25 V 9.98 x 3.99 x 1.5mm 9.98mm 3.99mm 1.5mm
RS Stock No. 686-5926
Mfr. Part No.ST16C550CQ48-F
BrandMaxLinear
€4.34
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. 811-2971
Mfr. Part No.XR28V382IL32-F
BrandMaxLinear
€4.47
Each
units
2 IrDA, RS232, RS485 128B 128B 3Mbit/s Yes Surface Mount QFN 32 3.3 V 5 x 5 x 0.95mm 5mm 5mm 0.95mm
RS Stock No. 700-4377
Mfr. Part No.XR21V1410IL16-F
BrandEXAR
€3.27
Each
units
- - - - - - Surface Mount QFN 16 - 3 x 3 x 0.88mm 3mm 3mm 0.88mm
RS Stock No. 816-0239
Mfr. Part No.SC16IS762IPW,112
BrandNXP
€3.157
Each (In a Pack of 3)
units
2 IrDA, UART - - 5Mbit/s Yes Surface Mount TSSOP 28 2.5 V, 3.3 V 9.8 x 4.5 x 0.95mm 9.8mm 4.5mm 0.95mm
RS Stock No. 170-4579
Mfr. Part No.XR16L2750CM-F
BrandEXAR
€4.779
Each (In a Tray of 250)
units
2 IrDA, RS422, RS485 - - 6.25Mbit/s Yes Surface Mount TQFP 48 2.5 V, 3.3 V, 5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
RS Stock No. 124-2421
Mfr. Part No.SC16IS752IPW,112
BrandNXP
€2.773
Each (In a Tube of 51)
units
2 IrDA 64B 64B 5Mbit/s - Surface Mount TSSOP 28 2.5 V, 3.3 V 9.8 x 4.5 x 0.75mm 9.8mm 4.5mm 0.75mm
RS Stock No. 170-9074
Mfr. Part No.FT220XS-R
BrandFTDI Chip
€1.336
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. 737-7843
Mfr. Part No.FT232HL-REEL
BrandFTDI Chip
€3.66
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. 913-4256
Mfr. Part No.XR16L788IQ-F
BrandMaxLinear
€27.105
Each (In a Tray of 66)
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. 686-5945
Mfr. Part No.ST16C554DCQ64-F
BrandMaxLinear
€7.89
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. 190-7271
Mfr. Part No.MAX3100CEE+T
€4.76
Each
units
- - - - - - - - - - - - - -
RS Stock No. 200-1781
Mfr. Part No.FT230XS-U
BrandFTDI Chip
€1.918
Each (In a Pack of 4)
units
1 RS232, RS422, RS485, SIE, UART - - 3Mbps - - SSOP 16 5 V - - - -
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