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. 531-2522
Mfr. Part No.TL16C554APN
HK$91.82
Each
units
4 - 16B 16B 1MBd Yes Surface Mount LQFP 80 5 V 12 x 12 x 1.4mm 12mm 12mm 1.4mm
RS Stock No. 923-1593
Mfr. Part No.FT201XS-R
BrandFTDI Chip
HK$12.992
Each (On a Reel of 3000)
units
1 SIE, UART 512B 512B 3.4Mbit/s Yes Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in 5mm 0.157in 1.5mm
RS Stock No. 786-1001
Mfr. Part No.MAX3140CEI+
HK$59.21
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. 178-9093
Mfr. Part No.TL16C550CFNR
HK$56.905
Each (In a Tube of 26)
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. 797-4737
Mfr. Part No.SC16C2550BIB48,151
BrandNXP
HK$52.71
Each
units
2 UART 16B 16B 5Mbit/s Yes Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7.1 x 7.1 x 1.6mm 7.1mm 7.1mm 1.6mm
RS Stock No. 686-6064
Mfr. Part No.XR82C684CJ-F
BrandEXAR
HK$158.30
Each
units
4 UART - - 1Mbit/s - Surface Mount PLCC 68 5 V 24.33 x 24.33 x 3.68mm 24.33mm 24.33mm 3.68mm
New
RS Stock No. 200-1779
Mfr. Part No.FT230XS-U
BrandFTDI Chip
HK$16.782
Each (In a Tube of 100)
units
1 RS232, RS422, RS485, SIE, UART - - 3Mbps - - SSOP 16 5 V - - - -
RS Stock No. 686-5890
Mfr. Part No.ST16C2550IQ48-F
BrandEXAR
HK$56.82
Each
units
2 RS232, RS485 16B 16B 4Mbit/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
New
RS Stock No. 190-7271
Mfr. Part No.MAX3100CEE+T
HK$47.60
Each
units
- - - - - - - - - - - - - -
RS Stock No. 913-4222
Mfr. Part No.ST16C2552CJ44TR-F
BrandEXAR
HK$37.369
Each (On a Reel of 500)
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
New
RS Stock No. 200-1777
Mfr. Part No.FT230XQ-T
BrandFTDI Chip
HK$15.046
Each (In a Tray of 490)
units
1 RS232, RS422, RS485, SIE, UART - - 3Mbps - - QFN 16 5 V - - - -
New
RS Stock No. 200-1783
Mfr. Part No.FT232HL-TRAY
BrandFTDI Chip
HK$37.70
Each (In a Pack of 2)
units
1 - - - 12Mbps - - LQFP 48 2.97 V - - - -
RS Stock No. 913-4238
Mfr. Part No.ST16C554DIQ64-F
BrandEXAR
HK$72.39
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. 913-4216
Mfr. Part No.ST16C2550CJ44-F
BrandEXAR
HK$53.05
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
RS Stock No. 170-4466
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
HK$33.89
Each (In a Tray of 490)
units
- - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm 5mm 5mm 0.88mm
RS Stock No. 182-2508
Mfr. Part No.TL16C450FN
HK$39.36
Each
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. 769-5563
Mfr. Part No.ST16C654IJ68-F
BrandEXAR
HK$134.43
Each
units
4 IrDA, RS232, RS422, RS485 64B 64B 1.5Mbit/s - Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 5.08mm 24.33mm 24.33mm 5.08mm
RS Stock No. 913-4253
Mfr. Part No.XR16L784CV-F
BrandEXAR
HK$159.93
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. 686-5963
Mfr. Part No.XR16C2850CM-F
BrandEXAR
HK$128.70
Each
units
2 IrDA 128B 128B 6.25Mbit/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. 814-4032
Mfr. Part No.TIR1000PSR
HK$14.018
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
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