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. 686-5954
Mfr. Part No.ST16C554DIJ68-F
BrandEXAR
SGD18.81
Each
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. 923-1581
Mfr. Part No.FT230XS-R
BrandFTDI Chip
SGD2.725
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. 170-4453
Mfr. Part No.ST16C554DIJ68-F
BrandEXAR
SGD16.94
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. 757-0010
Mfr. Part No.FT230XS-R
BrandFTDI Chip
SGD3.295
Each (In a Pack of 2)
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. 816-0239
Mfr. Part No.SC16IS762IPW,112
BrandNXP
SGD8.06
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. 124-2422
Mfr. Part No.SC16IS762IPW,112
BrandNXP
SGD6.86
Each (In a Tube of 51)
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. 687-7720
Mfr. Part No.FT2232HL
BrandFTDI Chip
SGD10.38
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. 162-4339
Mfr. Part No.TL16C450FN
SGD6.24
Each (In a Tube of 26)
units
1 - - - 0.256Mbit/s - Surface Mount PLCC 44 5 V 16.59 x 16.59 x 4.06mm 16.59mm 16.59mm 4.06mm
RS Stock No. 888-8722
Mfr. Part No.FT231XS-U
BrandFTDI Chip
SGD2.31
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. 662-3911
Mfr. Part No.TL16C452FNR
SGD10.16
Each
units
2 - - - 0.256Mbit/s - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 923-1607
Mfr. Part No.FT231XS-R
BrandFTDI Chip
SGD2.344
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. 182-2570
Mfr. Part No.TL16C452FN
SGD10.56
Each
units
2 - - - 0.256Mbit/s - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 757-0032
Mfr. Part No.FT231XS-R
BrandFTDI Chip
SGD3.255
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. 686-5884
Mfr. Part No.ST16C2550CJ44-F
BrandEXAR
SGD11.39
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. 170-9070
Mfr. Part No.FT2232HL
BrandFTDI Chip
SGD8.158
Each (On a Reel of 1000)
units
2 RS232, RS422, RS485 - - 480Mbit/s - Surface Mount LQFP 64 - 10 x 10 x 1.4mm 10mm 10mm 1.4mm
RS Stock No. 757-0026
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
SGD3.07
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. 162-7082
Mfr. Part No.TL16C452FNR
SGD6.87
Each (On a Reel of 250)
units
2 - - - 0.256Mbit/s - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 170-4468
Mfr. Part No.XR21V1410IL16-F
BrandEXAR
SGD3.87
Each (In a Tray of 490)
units
- - - - - - Surface Mount QFN 16 - 3 x 3 x 0.88mm 3mm 3mm 0.88mm
RS Stock No. 700-4377
Mfr. Part No.XR21V1410IL16-F
BrandEXAR
SGD5.85
Each
units
- - - - - - Surface Mount QFN 16 - 3 x 3 x 0.88mm 3mm 3mm 0.88mm
RS Stock No. 913-4216
Mfr. Part No.ST16C2550CJ44-F
BrandEXAR
SGD9.34
Each (In a Tube of 27)
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
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