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. 686-5935
Mfr. Part No.ST16C552CJ68-F
BrandEXAR
SGD11.74
Each
units
2 - 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. 769-5560
Mfr. Part No.ST16C654DIQ64-F
BrandEXAR
SGD26.50
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. 170-4515
Mfr. Part No.XR16C854IQ-F
BrandEXAR
SGD28.843
Each (In a Tube of 66)
units
4 IrDA, RS232, RS422, RS485 128B 128B 2Mbit/s Yes Surface Mount QFP 100 2.97 → 5.5 V 20.1 x 14.1 x 3.05mm 20.1mm 14.1mm 3.05mm
RS Stock No. 769-5608
Mfr. Part No.XR20M1172IG28-F
BrandEXAR
SGD8.85
Each
units
2 IrDA, RS232, RS422, RS485 64B 64B 16Mbit/s Yes Surface Mount TSSOP 28 1.6 → 3.6 V 9.8 x 4.5 x 1.05mm 9.8mm 4.5mm 1.05mm
RS Stock No. 847-2901
Mfr. Part No.XR16L2750CM-F
BrandEXAR
SGD12.12
Each
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. 166-0323
Mfr. Part No.SC16C550BIB48,128
BrandNXP
SGD2.914
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. 757-0017
Mfr. Part No.FT200XD-R
BrandFTDI Chip
SGD2.98
Each (In a Pack of 2)
units
1 SIE, UART 512B 512B 3.4Mbit/s Yes Surface Mount DFN 10 5 V 3 x 3 x 0.75mm 3mm 3mm 0.75mm
RS Stock No. 170-9074
Mfr. Part No.FT220XS-R
BrandFTDI Chip
SGD2.983
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. 662-5295
Mfr. Part No.TL16C2550PFB
SGD9.47
Each
units
2 - 16B 16B 1.5MBd Yes Surface Mount TQFP 48 5 V 7 x 7 x 1mm 7mm 7mm 1mm
RS Stock No. 170-4516
Mfr. Part No.XR20M1172IG28-F
BrandEXAR
SGD7.26
Each (In a Tube of 50)
units
2 IrDA, RS232, RS422, RS485 64B 64B 16Mbit/s Yes Surface Mount TSSOP 28 1.6 → 3.6 V 9.8 x 4.5 x 1.05mm 9.8mm 4.5mm 1.05mm
RS Stock No. 686-5957
Mfr. Part No.ST16C554DIQ64-F
BrandEXAR
SGD16.87
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. 913-4256
Mfr. Part No.XR16L788IQ-F
BrandEXAR
SGD35.37
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. 170-4518
Mfr. Part No.XR88C681J-F
BrandEXAR
SGD11.80
Each (In a Tube of 27)
units
2 RS232, RS422, RS485 1B 3B 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 4.57mm 16.66mm 16.66mm 4.57mm
New
RS Stock No. 189-7774
Mfr. Part No.MAX3107ETG+
SGD9.512
Each (In a Tube of 86)
units
1 RS232, RS485 - - 24Mbps Yes Surface Mount TQFN 24 2.35 3.6 V 3.6 x 3.6 x 0.75mm 3.6mm 3.6mm 0.75mm
RS Stock No. 545-8117
Mfr. Part No.TL16C754BPN
SGD26.20
Each
units
4 - 64B 64B 3Mbit/s - Surface Mount LQFP 80 2.7 → 5.5 V 12 x 12 x 1.4mm 12mm 12mm 1.4mm
RS Stock No. 786-1001
Mfr. Part No.MAX3140CEI+
SGD12.67
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. 769-6071
Mfr. Part No.ST16C1550CJ28-F
BrandEXAR
SGD7.52
Each
units
1 RS232, RS422, RS485 16B 16B 1.5Mbit/s - Surface Mount PLCC 28 2.97 → 5.5 V 11.58 x 11.58 x 4.57mm 11.58mm 11.58mm 4.57mm
RS Stock No. 913-4253
Mfr. Part No.XR16L784CV-F
BrandEXAR
SGD27.607
Each (In a Tray of 160)
units
4 IrDA 64B 64B 6.25Mbit/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. 686-5904
Mfr. Part No.ST16C2552CJ44TR-F
BrandEXAR
SGD11.90
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. 170-4447
Mfr. Part No.ST16C550IQ48-F
BrandEXAR
SGD5.872
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
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