UART

UART stands for Universal Asynchronous Receiver-Transmitter. UART is a type of serial communication interface designed 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. Asynchronous is a type of serial communication where the interfaces at each end are not synchronised by a common clock signal.

These particular UART devices are stand-alone integrated circuits (ICs). However, you can also find UARTs within microcontrollers (MCUs), as they only require two wires for communication.

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).

Where is UART used?

  • Microcontroller based devices
  • GPS receivers
  • Bluetooth devices
  • Modems
  • Wireless communications

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.


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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. 769-5567
Mfr. Part No.ST16C654IQ64-F
BrandMaxLinear
TWD545.00
Each
units
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 - - -
RS Stock No. 847-2901
Mfr. Part No.XR16L2750CM-F
BrandMaxLinear
TWD268.00
Each
units
2 IrDA, RS422, RS485 - - 6.25Mbit/s Yes Surface Mount TQFP 48 2.5 V, 3.3 V, 5 V 7.1 x 7.1 x 1.05mm - - -
RS Stock No. 913-4228
Mfr. Part No.ST16C2550IQ48-F
BrandMaxLinear
TWD178.70
Each (In a Tray of 250)
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 - - -
RS Stock No. 189-7774
Mfr. Part No.MAX3107ETG+
TWD207.60
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 - - -
RS Stock No. 700-4371
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
TWD263.00
Each
units
2 - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm - - -
RS Stock No. 170-4542
Mfr. Part No.XR16V554DIV-F
BrandEXAR
TWD302.80
Each (In a Tray of 160)
units
4 - 16B 16B 4Mbit/s - Surface Mount LQFP 64 2.25 → 3.6 V 10.1 x 10.1 x 1.45mm - - -
RS Stock No. 913-4231
Mfr. Part No.ST16C550CJ44-F
BrandMaxLinear
TWD116.30
Each (In a Tube of 27)
units
1 RS232, RS422, RS485 16B 16B 1.5Mbit/s - Surface Mount PLCC 44 2.97 → 5.5 V 16.66 x 16.66 x 4.57mm - - -
RS Stock No. 913-4250
Mfr. Part No.XR82C684CJ/44-F
BrandMaxLinear
TWD558.60
Each (In a Tube of 27)
units
4 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm - - -
RS Stock No. 182-2570
Mfr. Part No.TL16C452FN
TWD252.00
Each
units
2 - - - 0.256Mbit/s - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm - - -
RS Stock No. 190-1375
Mfr. Part No.MAX3109ETJ+
TWD243.00
Each (In a Pack of 2)
units
1 RS232, RS485 - - 24Mbit/s Yes Surface Mount TQFN 32 1.71 → 3.6 V 5.0 x 5.0 x 0.43mm - - -
RS Stock No. 173-0790
Mfr. Part No.XR20M1170IG16-F
BrandEXAR
TWD171.30
Each (In a Tube of 95)
units
1 IrDA, RS232, RS422, RS485 64B 64B 16Mbit/s Yes Surface Mount TSSOP 16 1.6 → 3.6 V 5.1 x 4.5 x 0.95mm - - -
RS Stock No. 733-6381
Mfr. Part No.XR16M890IL32-F
BrandMaxLinear
TWD134.00
Each
units
1 RS232, RS422, RS485 UART 128B 128B 24Mbit/s Yes Surface Mount QFN 32 1.8 V, 2.5 V, 3.3 V 5 x 5 x 0.88mm - - -
RS Stock No. 797-4737
Mfr. Part No.SC16C2550BIB48,151
BrandNXP
TWD253.00
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 - - -
RS Stock No. 162-4339
Mfr. Part No.TL16C450FN
TWD130.40
Each (In a Tube of 26)
units
1 - - - 0.256Mbit/s - Surface Mount PLCC 44 5 V 16.59 x 16.59 x 4.06mm - - -
RS Stock No. 190-6193
Mfr. Part No.MAX3100CEE+T
TWD160.40
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 - - -
RS Stock No. 170-4466
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
TWD135.30
Each (In a Tray of 490)
units
2 - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm - - -
RS Stock No. 797-4753
Mfr. Part No.SC16C752BIB48,151
BrandNXP
TWD193.00
Each
units
2 UART 64B 64B 5Mbit/s Yes Surface Mount LQFP 48 2.2 V, 2.5 V, 5 V 7.1 x 7.1 x 1.45mm - - -
RS Stock No. 165-9562
Mfr. Part No.MAX3100CPD+
TWD211.60
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 - - -
RS Stock No. 170-4455
Mfr. Part No.XR17D152CM-F
BrandEXAR
TWD761.10
Each (In a Tube of 90)
units
2 RS232, RS422, RS485 64B 64B 6.25Mbit/s Yes Surface Mount TQFP 100 5 V 14.1 x 14.1 x 1.05mm - - -
RS Stock No. 686-5957
Mfr. Part No.ST16C554DIQ64-F
BrandMaxLinear
TWD419.00
Each
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 - - -