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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Part Details Brand Number of Channels per Chip Standard Supported Transmit FIFO Receive FIFO Maximum Data Rate Mounting Type Package Type Pin Count Typical Operating Supply Voltage Dimensions Length Width Height Maximum Operating Temperature Minimum Operating Temperature
EXAR Quad-Channel, LQFP UART 1.5Mbit/s, 2.97 → 5.5 V, 64-Pin ST16C554DCQ64-F
  • RS Stock No. 686-5945
  • Brand EXAR
  • Mfr. Part No. ST16C554DCQ64-F
EXAR 4 - 16B 16B 1.5Mbit/s Surface Mount LQFP 64 2.97 → 5.5 V 10.1 x 10.1 x 1.45mm 10.1mm 10.1mm 1.45mm +70 °C 0 °C
FTDI Chip, QFN USB to Serial UART RS232, RS422, RS485 UART 3MBd, 5 V, 32-Pin FT232RQ-REEL FTDI Chip 1 RS232, RS422, RS485 UART 256B 128B 3MBd Surface Mount QFN 32 5 V 5 x 5mm 5mm 5mm - +85 °C -40 °C
Texas Instruments, SOIC UART Interface, 8-Pin TIR1000PSR Texas Instruments - - - - - Surface Mount SOIC 8 - 6.5 x 5.6 x 1.85mm 6.5mm 5.6mm 1.85mm +70 °C 0 °C
FTDI Chip, SSOP Interface RS232, RS422, RS485, SIE, UART 3MBd, 5 V, 20-Pin FT231XS-R FTDI Chip 1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Surface Mount SSOP 20 5 V 0.344 x 0.157 x 0.059in 8.74mm 0.157in 1.5mm +85 °C -40 °C
EXAR, TQFP UART IrDA, RS232, RS422, RS485 3.125Mbit/s, 2.25 → 5.5 V, 48-Pin XR16L580IM-F
  • RS Stock No. 769-5589
  • Brand EXAR
  • Mfr. Part No. XR16L580IM-F
EXAR 1 IrDA, RS232, RS422, RS485 16B 16B 3.125Mbit/s Surface Mount TQFP 48 2.25 → 5.5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm +85 °C -40 °C
Texas Instruments, LQFP UART 1MBd, 3 → 5.25 V, 48-Pin TL16C550CPTR Texas Instruments 1 - 16B 16B 1MBd Surface Mount LQFP 48 3 → 5.25 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm +70 °C 0 °C
Maxim, QSOP UART IrDA, 2.7 → 5.5 V, 16-Pin MAX3100EEE+ Maxim 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 +85 °C -40 °C
Texas Instruments, PLCC UART 1MBd, 3 → 5.25 V, 44-Pin TL16C550CFNR Texas Instruments 1 - 16B 16B 1MBd Surface Mount PLCC 44 3 → 5.25 V 16.59 x 16.59 x 4.06mm 16.59mm 16.59mm 4.06mm +70 °C 0 °C
FTDI Chip, SSOP UART Interface RS232, RS422, RS485, SIE, UART 3MBd, 5 V, 16-Pin FT230XS-R FTDI Chip 1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in 5mm 0.157in 1.5mm +85 °C -40 °C
FTDI Chip Dual-Channel, LQFP UART Interface RS232, RS422, RS485 480Mbit/s, 64-Pin FT2232HL FTDI Chip 2 RS232, RS422, RS485 - - 480Mbit/s Surface Mount LQFP 64 - 10 x 10 x 1.4mm 10mm 10mm 1.4mm +85 °C -40 °C
EXAR Dual-Channel, QFN UART Interface IrDA, RS232, RS485 3Mbit/s, 3.3 V, 32-Pin XR28V382IL32-F
  • RS Stock No. 811-2971
  • Brand EXAR
  • Mfr. Part No. XR28V382IL32-F
EXAR 2 IrDA, RS232, RS485 128B 128B 3Mbit/s Surface Mount QFN 32 3.3 V 5 x 5 x 0.95mm 5mm 5mm 0.95mm +85 °C -40 °C
EXAR Dual-Channel, PLCC UART RS232, RS485 4Mbit/s, 2.97 → 5.5 V, 44-Pin ST16C2552CJ44TR-F
  • RS Stock No. 686-5904
  • Brand EXAR
  • Mfr. Part No. ST16C2552CJ44TR-F
EXAR 2 RS232, RS485 16B 16B 4Mbit/s Surface Mount PLCC 44 2.97 → 5.5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm +70 °C 0 °C
FTDI Chip, SSOP Interface SIE, UART 500kbit/s, 5 V, 16-Pin FT220XS-R FTDI Chip 1 SIE, UART 512B 512B 500kbit/s Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in 5mm 0.157in 1.5mm +85 °C -40 °C
EXAR, QFN UART, 32-Pin XR21V1412IL32-F
  • RS Stock No. 700-4371
  • Brand EXAR
  • Mfr. Part No. XR21V1412IL32-F
EXAR - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm 5mm 5mm 0.88mm +85 °C -40 °C
EXAR Dual-Channel, TQFP UART RS232, RS485 4Mbit/s, 2.97 → 5.5 V, 48-Pin ST16C2550IQ48-F
  • RS Stock No. 686-5890
  • Brand EXAR
  • Mfr. Part No. ST16C2550IQ48-F
EXAR 2 RS232, RS485 16B 16B 4Mbit/s Surface Mount TQFP 48 2.97 → 5.5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm +85 °C -40 °C
EXAR, QFN UART, 16-Pin XR21V1410IL16-F
  • RS Stock No. 700-4377
  • Brand EXAR
  • Mfr. Part No. XR21V1410IL16-F
EXAR - - - - - Surface Mount QFN 16 - 3 x 3 x 0.88mm 3mm 3mm 0.88mm +85 °C -40 °C
EXAR, TQFP UART 1.5Mbit/s, 2.97 → 5.5 V, 48-Pin ST16C550CQ48-F
  • RS Stock No. 686-5926
  • Brand EXAR
  • Mfr. Part No. ST16C550CQ48-F
EXAR 1 - 16B 16B 1.5Mbit/s Surface Mount TQFP 48 2.97 → 5.5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm +70 °C 0 °C
FTDI Chip, QFN USB to Serial UART RS232, RS422, RS485 UART 12Mbit/s, 1.8 V, 3.3 V, 48-Pin FT232HQ-REEL FTDI Chip 1 RS232, RS422, RS485 UART - - 12Mbit/s Surface Mount QFN 48 1.8 V, 3.3 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm +85 °C -40 °C
EXAR Quad-Channel, LQFP UART IrDA, RS232, RS422, RS485 1.5Mbit/s, 2.97 → 5.5 V, 64-Pin ST16C654IQ64-F
  • RS Stock No. 769-5567
  • Brand EXAR
  • Mfr. Part No. ST16C654IQ64-F
EXAR 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 +85 °C -40 °C
EXAR Dual-Channel, TQFP UART IrDA 6.25Mbit/s, 2.97 → 5.5 V, 48-Pin XR16C2850CM-F
  • RS Stock No. 686-5963
  • Brand EXAR
  • Mfr. Part No. XR16C2850CM-F
EXAR 2 IrDA 128B 128B 6.25Mbit/s Surface Mount TQFP 48 2.97 → 5.5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm +70 °C 0 °C
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