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. 686-5945
Mfr. Part No.ST16C554DCQ64-F
BrandMaxLinear
HK$80.56
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. 686-5995
Mfr. Part No.XR16L788CQ-F
BrandMaxLinear
HK$303.81
Each
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. 165-9400
Mfr. Part No.MAX3140CEI+
HK$64.863
Each (In a Tube of 50)
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. 923-1584
Mfr. Part No.FT232HL-REEL
BrandFTDI Chip
HK$31.01
Each (On a Reel of 1500)
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. 162-7083
Mfr. Part No.TL16C550CPTR
HK$18.509
Each (On a Reel of 1000)
units
1 - 16B 16B 1MBd Yes Surface Mount LQFP 48 3 → 5.25 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 124-2421
Mfr. Part No.SC16IS752IPW,112
BrandNXP
HK$33.557
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
New
RS Stock No. 203-5827
Mfr. Part No.MAX17841BGUE/V+
HK$69.10
Each
units
1 UART - - 2Mbps - - TSSOP 16 3.1 → 3.5 V - - - -
RS Stock No. 162-8368
Mfr. Part No.TIR1000PSR
HK$5.675
Each (On a Reel of 2000)
units
- - - - - - Surface Mount SOIC 8 - 6.5 x 5.6 x 1.85mm 6.5mm 5.6mm 1.85mm
RS Stock No. 686-5941
Mfr. Part No.ST16C554DCJ68-F
BrandMaxLinear
HK$103.47
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. 190-1351
Mfr. Part No.MAX3107ETG+
HK$59.935
Each (In a Pack of 2)
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. 913-4234
Mfr. Part No.ST16C554DCQ64-F
BrandMaxLinear
HK$66.083
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. 190-1465
Mfr. Part No.MAX14830ETM+
HK$128.77
Each
units
4 RS485 - - 24MBd - Surface Mount TQFN 48 2.35 → 3.6 V 7.1 x 7.1 x 0.75mm 7.1mm 7.1mm 0.75mm
RS Stock No. 913-4301
Mfr. Part No.ST16C654IQ64-F
BrandMaxLinear
HK$114.529
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. 189-7770
Mfr. Part No.MAX3100CEE+
HK$47.309
Each (In a Tube of 100)
units
1 IrDA 16B 16B 0.23MBd - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.55mm 4.98mm 3.99mm 1.55mm
RS Stock No. 757-0036
Mfr. Part No.FT221XS-R
BrandFTDI Chip
HK$23.36
Each (In a Pack of 2)
units
1 SIE, UART 512B 512B 1Mbit/s Yes Surface Mount SSOP 20 5 V 0.344 x 0.157 x 0.059in 8.74mm 0.157in 1.5mm
RS Stock No. 847-2908
Mfr. Part No.XR16C850CM-F
BrandMaxLinear
HK$103.82
Each
units
1 IrDA, RS232, RS422, RS485 - - 2Mbit/s Yes Surface Mount TQFP 48 3.3 V, 5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
RS Stock No. 189-7775
Mfr. Part No.MAX3109ETJ+
HK$66.083
Each (In a Tube of 60)
units
1 RS232, RS485 - - 24Mbit/s Yes Surface Mount TQFN 32 1.71 → 3.6 V 5.0 x 5.0 x 0.43mm 5mm 5.0mm 0.43mm
RS Stock No. 913-4256
Mfr. Part No.XR16L788IQ-F
BrandMaxLinear
HK$318.263
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. 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. 757-0017
Mfr. Part No.FT200XD-R
BrandFTDI Chip
HK$17.625
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
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