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. 923-7661
Mfr. Part No.MAX14830ETM+
£11.144
Each (In a Tube of 43)
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. 165-9562
Mfr. Part No.MAX3100CPD+
£4.491
Each (In a Tube of 25)
Units
1 IrDA 16B 16B 0.23MBd - Through Hole PDIP 14 3.3 V, 5 V 19.43 x 7.87 x 4.45mm 19.43mm 7.87mm 4.45mm
RS Stock No. 732-9140
Mfr. Part No.MAX3100CPD+
£5.47
Each
Units
1 IrDA 16B 16B 0.23MBd - Through Hole PDIP 14 3.3 V, 5 V 19.43 x 7.87 x 4.45mm 19.43mm 7.87mm 4.45mm
RS Stock No. 622-7964
Mfr. Part No.MAX3100CEE+
£3.99
Each
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. 146-1017
Mfr. Part No.MAX3100CEE+
£3.538
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. 165-9400
Mfr. Part No.MAX3140CEI+
£5.044
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. 786-1001
Mfr. Part No.MAX3140CEI+
£5.55
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. 165-9559
Mfr. Part No.MAX3109ETJ+
£4.964
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. 799-2849
Mfr. Part No.MAX3109ETJ+
£5.46
Each
Units
1 RS232, RS485 - - 24Mbit/s Yes Surface Mount TQFN 32 1.71 to 3.6 V 5.0 x 5.0 x 0.43mm 5mm 5.0mm 0.43mm
New
RS Stock No. 190-1333
Mfr. Part No.MAX3107EAG+
£5.08
Each (In a Pack of 2)
Units
1 RS232, RS485 - - 24Mbps Yes Surface Mount SSOP 24 2.35 → 3.6 V 8.33 x 5.38 x 1.78mm 8.33mm 5.38mm 1.78mm
New
RS Stock No. 190-1351
Mfr. Part No.MAX3107ETG+
£5.015
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
New
RS Stock No. 189-7772
Mfr. Part No.MAX3100EEE+
£4.766
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
New
RS Stock No. 190-7271
Mfr. Part No.MAX3100CEE+T
£6.86
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 189-7773
Mfr. Part No.MAX3107EAG+
£4.596
Each (In a Tube of 58)
Units
1 RS232, RS485 - - 24Mbps Yes Surface Mount SSOP 24 2.35 3.6 V 8.33 x 5.38 x 1.78mm 8.33mm 5.38mm 1.78mm
New
RS Stock No. 190-1312
Mfr. Part No.MAX3100EEE+
£5.67
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
New
RS Stock No. 189-7769
Mfr. Part No.MAX14830ETM+
£10.689
Each (In a Tube of 43)
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
New
RS Stock No. 190-1465
Mfr. Part No.MAX14830ETM+
£14.23
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
New
RS Stock No. 190-6193
Mfr. Part No.MAX3100CEE+T
£3.506
Each (On a Reel of 2500)
Units
1 IrDA, RS232, RS485 - - - - Surface Mount QSOP 16 2.7 5.5 V 4.98 x 3.99 x 1.65mm 4.98mm 3.99mm 1.65mm
New
RS Stock No. 189-7774
Mfr. Part No.MAX3107ETG+
£4.558
Each (In a Tube of 86)
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