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. 170-4446
Mfr. Part No.ST16C550CQ48-F
BrandEXAR
HK$30.311
Each (In a Tray of 250)
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. 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. 165-9562
Mfr. Part No.MAX3100CPD+
HK$62.34
Each (In a Tube of 25)
units
1 IrDA 16B 16B 0.23MBd - Through Hole PDIP 14 3.3 V, 5 V 19.43 x 7.87 x 4.45mm 19.43mm 7.87mm 4.45mm
RS Stock No. 725-8843
Mfr. Part No.SC16C550BIB48,128
BrandNXP
HK$22.93
Each
units
1 UART 16B 16B 3Mbit/s - Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
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. 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. 888-8729
Mfr. Part No.FT231XQ-T
BrandFTDI Chip
HK$18.447
Each (In a Pack of 10)
units
- - - - - - Surface Mount QFN 20 - 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 811-2971
Mfr. Part No.XR28V382IL32-F
BrandMaxLinear
HK$42.48
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. 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
RS Stock No. 687-7720
Mfr. Part No.FT2232HL
BrandFTDI Chip
HK$53.97
Each
units
2 RS232, RS422, RS485 - - 480Mbit/s - Surface Mount LQFP 64 - 10 x 10 x 1.4mm 10mm 10mm 1.4mm
RS Stock No. 662-3915
Mfr. Part No.TL16C550CFNR
HK$41.67
Each (In a Pack of 5)
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. 200-1777
Mfr. Part No.FT230XQ-T
BrandFTDI Chip
HK$17.329
Each (In a Tray of 490)
units
1 RS232, RS422, RS485, SIE, UART - - 3Mbps - - QFN 16 5 V - - - -
RS Stock No. 923-1616
Mfr. Part No.FT240XQ-R
BrandFTDI Chip
HK$15.102
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. 170-4554
Mfr. Part No.XR28V382IL32-F
BrandEXAR
HK$30.513
Each (In a Tray of 490)
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. 166-0323
Mfr. Part No.SC16C550BIB48,128
BrandNXP
HK$13.681
Each (On a Reel of 2000)
units
1 UART 16B 16B 3Mbit/s - Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 769-5605
Mfr. Part No.XR20M1170IG16-F
BrandMaxLinear
HK$35.78
Each (In a Pack of 2)
units
1 IrDA, RS232, RS422, RS485 64B 64B 16Mbit/s Yes Surface Mount TSSOP 16 1.6 → 3.6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm 0.95mm
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