Universal Asynchronous Receivers & Transmitters

Universal Asynchronous Receiver-Transmitter, more commonly referred to as UART, is a type of serial communication interface. UART’s 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. 170-9070
Mfr. Part No.FT2232HL
BrandFTDI Chip
$8.587
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. 730-0168
Mfr. Part No.FT232RQ-REEL
BrandFTDI Chip
$6.75
Each
units
1 RS232, RS422, RS485 UART 256B 128B 3MBd - Surface Mount QFN 32 5 V 5 x 5mm 5mm 5mm -
RS Stock No. 687-7720
Mfr. Part No.FT2232HL
BrandFTDI Chip
$12.88
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. 170-9073
Mfr. Part No.FT232RQ-REEL
BrandFTDI Chip
$5.188
Each (On a Reel of 6000)
units
1 RS232, RS422, RS485 UART 256B 128B 3MBd - Surface Mount QFN 32 5 V 5 x 5mm 5mm 5mm -
RS Stock No. 124-2421
Mfr. Part No.SC16IS752IPW,112
BrandNXP
$5.013
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
RS Stock No. 725-8846
Mfr. Part No.SC16IS752IPW,112
BrandNXP
$6.13
Each
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
RS Stock No. 757-0026
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
$3.085
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. 923-1597
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
$2.60
Each (On a Reel of 5000)
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. 648-0092
Mfr. Part No.PC16550DV/NOPB
$12.96
Each
units
1 - 16B 16B 1.5MBd Yes Surface Mount PLCC 44 5 V 16.51 x 16.51 x 3.68mm 16.51mm 16.51mm 3.68mm
RS Stock No. 913-4250
Mfr. Part No.XR82C684CJ/44-F
BrandEXAR
$19.423
Each (In a Tube of 27)
units
4 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 170-4453
Mfr. Part No.ST16C554DIJ68-F
BrandEXAR
$14.313
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. 124-2420
Mfr. Part No.SC16C2550BIB48,151
BrandNXP
$8.012
Each (In a Tray of 250)
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. 913-4253
Mfr. Part No.XR16L784CV-F
BrandEXAR
$24.487
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
New
RS Stock No. 190-1253
Mfr. Part No.MAX3100CEE+
BrandMaxim
$9.90
Each (In a Pack of 2)
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. 170-4459
Mfr. Part No.XR88C681CJ-F
BrandEXAR
$10.906
Each (In a Tube of 27)
units
2 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 170-4454
Mfr. Part No.XR16C2850CM-F
BrandEXAR
$21.541
Each (In a Tray of 250)
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. 769-5563
Mfr. Part No.ST16C654IJ68-F
BrandEXAR
$25.88
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. 913-4216
Mfr. Part No.ST16C2550CJ44-F
BrandEXAR
$8.674
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. 757-0023
Mfr. Part No.FT201XS-R
BrandFTDI Chip
$3.225
Each (In a Pack of 2)
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. 686-6064
Mfr. Part No.XR82C684CJ-F
BrandEXAR
$23.20
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
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