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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16B Please note that the Stock level on this page is periodically updated during the day.

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1.5Mbit/s Please note that the Stock level on this page is periodically updated during the day.

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Surface Mount Please note that the Stock level on this page is periodically updated during the day.

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TQFP Please note that the Stock level on this page is periodically updated during the day.

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48 Please note that the Stock level on this page is periodically updated during the day.

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2.97 → 5.5 V Please note that the Stock level on this page is periodically updated during the day.

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7.1 x 7.1 x 1.05mm Please note that the Stock level on this page is periodically updated during the day.

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7.1mm Please note that the Stock level on this page is periodically updated during the day.

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7.1mm Please note that the Stock level on this page is periodically updated during the day.

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1.05mm Please note that the Stock level on this page is periodically updated during the day.

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+70 °C Please note that the Stock level on this page is periodically updated during the day.

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0 °C Please note that the Stock level on this page is periodically updated during the day.

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  • RS Stock No. 700-4380
  • Brand EXAR
  • Mfr. Part No. XR21V1414IM48-F
EXAR Please note that the Stock level on this page is periodically updated during the day.

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268 Please note that the Stock level on this page is periodically updated during the day.

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- - - - - Surface Mount Please note that the Stock level on this page is periodically updated during the day.

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TQFP Please note that the Stock level on this page is periodically updated during the day.

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48 Please note that the Stock level on this page is periodically updated during the day.

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- 7 x 7 x 1mm Please note that the Stock level on this page is periodically updated during the day.

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7mm Please note that the Stock level on this page is periodically updated during the day.

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7mm Please note that the Stock level on this page is periodically updated during the day.

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1mm Please note that the Stock level on this page is periodically updated during the day.

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+85 °C Please note that the Stock level on this page is periodically updated during the day.

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-40 °C Please note that the Stock level on this page is periodically updated during the day.

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  • RS Stock No. 686-5890
  • Brand EXAR
  • Mfr. Part No. ST16C2550IQ48-F
EXAR Please note that the Stock level on this page is periodically updated during the day.

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262 Please note that the Stock level on this page is periodically updated during the day.

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2 Please note that the Stock level on this page is periodically updated during the day.

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RS232, RS485 Please note that the Stock level on this page is periodically updated during the day.

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16B Please note that the Stock level on this page is periodically updated during the day.

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16B Please note that the Stock level on this page is periodically updated during the day.

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4Mbit/s Please note that the Stock level on this page is periodically updated during the day.

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Surface Mount Please note that the Stock level on this page is periodically updated during the day.

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TQFP Please note that the Stock level on this page is periodically updated during the day.

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48 Please note that the Stock level on this page is periodically updated during the day.

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2.97 → 5.5 V Please note that the Stock level on this page is periodically updated during the day.

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7.1 x 7.1 x 1.05mm Please note that the Stock level on this page is periodically updated during the day.

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7.1mm Please note that the Stock level on this page is periodically updated during the day.

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7.1mm Please note that the Stock level on this page is periodically updated during the day.

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1.05mm Please note that the Stock level on this page is periodically updated during the day.

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+85 °C Please note that the Stock level on this page is periodically updated during the day.

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-40 °C Please note that the Stock level on this page is periodically updated during the day.

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  • RS Stock No. 686-5945
  • Brand EXAR
  • Mfr. Part No. ST16C554DCQ64-F
EXAR Please note that the Stock level on this page is periodically updated during the day.

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261 Please note that the Stock level on this page is periodically updated during the day.

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4 Please note that the Stock level on this page is periodically updated during the day.

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- 16B Please note that the Stock level on this page is periodically updated during the day.

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16B Please note that the Stock level on this page is periodically updated during the day.

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1.5Mbit/s Please note that the Stock level on this page is periodically updated during the day.

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Surface Mount Please note that the Stock level on this page is periodically updated during the day.

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LQFP Please note that the Stock level on this page is periodically updated during the day.

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64 Please note that the Stock level on this page is periodically updated during the day.

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2.97 → 5.5 V Please note that the Stock level on this page is periodically updated during the day.

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10.1 x 10.1 x 1.45mm Please note that the Stock level on this page is periodically updated during the day.

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10.1mm Please note that the Stock level on this page is periodically updated during the day.

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10.1mm Please note that the Stock level on this page is periodically updated during the day.

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1.45mm Please note that the Stock level on this page is periodically updated during the day.

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+70 °C Please note that the Stock level on this page is periodically updated during the day.

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0 °C Please note that the Stock level on this page is periodically updated during the day.

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  • RS Stock No. 797-4737
  • Brand NXP
  • Mfr. Part No. SC16C2550BIB48,151
NXP Please note that the Stock level on this page is periodically updated during the day.

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217 Please note that the Stock level on this page is periodically updated during the day.

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2 Please note that the Stock level on this page is periodically updated during the day.

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UART Please note that the Stock level on this page is periodically updated during the day.

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16B Please note that the Stock level on this page is periodically updated during the day.

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16B Please note that the Stock level on this page is periodically updated during the day.

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5Mbit/s Please note that the Stock level on this page is periodically updated during the day.

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Surface Mount Please note that the Stock level on this page is periodically updated during the day.

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LQFP Please note that the Stock level on this page is periodically updated during the day.

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48 Please note that the Stock level on this page is periodically updated during the day.

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2.5 V, 3.3 V, 5 V Please note that the Stock level on this page is periodically updated during the day.

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7.1 x 7.1 x 1.6mm Please note that the Stock level on this page is periodically updated during the day.

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7.1mm Please note that the Stock level on this page is periodically updated during the day.

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7.1mm Please note that the Stock level on this page is periodically updated during the day.

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1.6mm Please note that the Stock level on this page is periodically updated during the day.

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+85 °C Please note that the Stock level on this page is periodically updated during the day.

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-40 °C Please note that the Stock level on this page is periodically updated during the day.

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MaxLinear Please note that the Stock level on this page is periodically updated during the day.

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212 Please note that the Stock level on this page is periodically updated during the day.

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4 Please note that the Stock level on this page is periodically updated during the day.

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IrDA, RS232, RS422, RS485 Please note that the Stock level on this page is periodically updated during the day.

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64B Please note that the Stock level on this page is periodically updated during the day.

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64B Please note that the Stock level on this page is periodically updated during the day.

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1.5Mbit/s Please note that the Stock level on this page is periodically updated during the day.

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Surface Mount Please note that the Stock level on this page is periodically updated during the day.

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LQFP Please note that the Stock level on this page is periodically updated during the day.

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64 Please note that the Stock level on this page is periodically updated during the day.

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2.97 → 5.5 V Please note that the Stock level on this page is periodically updated during the day.

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10 x 10 x 1.4mm Please note that the Stock level on this page is periodically updated during the day.

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10mm Please note that the Stock level on this page is periodically updated during the day.

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10mm Please note that the Stock level on this page is periodically updated during the day.

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1.4mm Please note that the Stock level on this page is periodically updated during the day.

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+85 °C Please note that the Stock level on this page is periodically updated during the day.

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-40 °C Please note that the Stock level on this page is periodically updated during the day.

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  • RS Stock No. 686-5913
  • Brand EXAR
  • Mfr. Part No. ST16C550CJ44-F
EXAR Please note that the Stock level on this page is periodically updated during the day.

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198 Please note that the Stock level on this page is periodically updated during the day.

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1 Please note that the Stock level on this page is periodically updated during the day.

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- 16B Please note that the Stock level on this page is periodically updated during the day.

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16B Please note that the Stock level on this page is periodically updated during the day.

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1.5Mbit/s Please note that the Stock level on this page is periodically updated during the day.

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Surface Mount Please note that the Stock level on this page is periodically updated during the day.

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PLCC Please note that the Stock level on this page is periodically updated during the day.

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44 Please note that the Stock level on this page is periodically updated during the day.

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2.97 → 5.5 V Please note that the Stock level on this page is periodically updated during the day.

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16.66 x 16.66 x 3.68mm Please note that the Stock level on this page is periodically updated during the day.

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16.66mm Please note that the Stock level on this page is periodically updated during the day.

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16.66mm Please note that the Stock level on this page is periodically updated during the day.

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3.68mm Please note that the Stock level on this page is periodically updated during the day.

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+70 °C Please note that the Stock level on this page is periodically updated during the day.

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0 °C Please note that the Stock level on this page is periodically updated during the day.

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  • RS Stock No. 686-5941
  • Brand EXAR
  • Mfr. Part No. ST16C554DCJ68-F
EXAR Please note that the Stock level on this page is periodically updated during the day.

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189 Please note that the Stock level on this page is periodically updated during the day.

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4 Please note that the Stock level on this page is periodically updated during the day.

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- 16B Please note that the Stock level on this page is periodically updated during the day.

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16B Please note that the Stock level on this page is periodically updated during the day.

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1.5Mbit/s Please note that the Stock level on this page is periodically updated during the day.

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Surface Mount Please note that the Stock level on this page is periodically updated during the day.

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PLCC Please note that the Stock level on this page is periodically updated during the day.

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68 Please note that the Stock level on this page is periodically updated during the day.

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2.97 → 5.5 V Please note that the Stock level on this page is periodically updated during the day.

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24.33 x 24.33 x 3.68mm Please note that the Stock level on this page is periodically updated during the day.

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24.33mm Please note that the Stock level on this page is periodically updated during the day.

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24.33mm Please note that the Stock level on this page is periodically updated during the day.

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3.68mm Please note that the Stock level on this page is periodically updated during the day.

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+70 °C Please note that the Stock level on this page is periodically updated during the day.

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0 °C Please note that the Stock level on this page is periodically updated during the day.

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