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. 170-4469
Mfr. Part No.XR21V1414IM48-F
BrandEXAR
HK$45.414
Each (In a Tray of 250)
units
4 - - - - - Surface Mount TQFP 48 - 7 x 7 x 1mm 7mm 7mm 1mm
RS Stock No. 923-1607
Mfr. Part No.FT231XS-R
BrandFTDI Chip
HK$15.603
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. 757-0032
Mfr. Part No.FT231XS-R
BrandFTDI Chip
HK$18.685
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. 725-8846
Mfr. Part No.SC16IS752IPW,112
BrandNXP
HK$35.43
Each
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. 786-1001
Mfr. Part No.MAX3140CEI+
HK$60.99
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. 814-4032
Mfr. Part No.TIR1000PSR
HK$14.10
Each (On a Tape of 5)
units
- - - - - - Surface Mount SOIC 8 - 6.5 x 5.6 x 1.85mm 6.5mm 5.6mm 1.85mm
RS Stock No. 170-4449
Mfr. Part No.ST16C554DCJ68-F
BrandEXAR
HK$107.138
Each (In a Tube of 19)
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm 24.33mm 24.33mm 3.68mm
RS Stock No. 799-2849
Mfr. Part No.MAX3109ETJ+
HK$60.11
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. 686-5904
Mfr. Part No.ST16C2552CJ44TR-F
BrandMaxLinear
HK$52.45
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. 170-4579
Mfr. Part No.XR16L2750CM-F
BrandEXAR
HK$50.578
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. 913-4238
Mfr. Part No.ST16C554DIQ64-F
BrandMaxLinear
HK$77.229
Each (In a Tray of 160)
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. 170-4455
Mfr. Part No.XR17D152CM-F
BrandEXAR
HK$166.529
Each (In a Tube of 90)
units
2 RS232, RS422, RS485 64B 64B 6.25Mbit/s Yes Surface Mount TQFP 100 5 V 14.1 x 14.1 x 1.05mm 14.1mm 14.1mm 1.05mm
RS Stock No. 923-1613
Mfr. Part No.FT231XQ-R
BrandFTDI Chip
HK$14.498
Each (On a Reel of 5000)
units
- - - - - - - - - - - - - -
RS Stock No. 769-5567
Mfr. Part No.ST16C654IQ64-F
BrandMaxLinear
HK$138.02
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. 686-5957
Mfr. Part No.ST16C554DIQ64-F
BrandMaxLinear
HK$94.04
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. 686-6005
Mfr. Part No.XR17D152CM-F
BrandMaxLinear
HK$159.14
Each
units
2 RS232, RS422, RS485 64B 64B 6.25Mbit/s Yes Surface Mount TQFP 100 5 V 14.1 x 14.1 x 1.05mm 14.1mm 14.1mm 1.05mm
RS Stock No. 686-5913
Mfr. Part No.ST16C550CJ44-F
BrandMaxLinear
HK$34.37
Each
units
1 - 16B 16B 1.5Mbit/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. 923-1587
Mfr. Part No.FT232HQ-REEL
BrandFTDI Chip
HK$29.802
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. 757-0014
Mfr. Part No.FT220XS-R
BrandFTDI Chip
HK$17.985
Each (In a Pack of 2)
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. 686-6067
Mfr. Part No.XR88C681CJ-F
BrandMaxLinear
HK$67.69
Each
units
2 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
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