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. 757-0026
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
HK$22.045
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 - - -
RS Stock No. 923-1597
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
HK$16.821
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 - - -
RS Stock No. 216-8416
Mfr. Part No.FT200XD-T
BrandFTDI Chip
HK$20.497
Each (In a Tray of 490)
units
- - 512B 512B 3.4Mbps - - DFN 10 +3.3 → 5.25 V - - - -
RS Stock No. 786-1001
Mfr. Part No.MAX3140CEI+
HK$90.98
Each
units
1 RS422, RS485 - - 230kBd - Surface Mount QSOP 28 4.75 → 5.25 V 9.98 x 3.99 x 1.5mm - - -
RS Stock No. 686-5890
Mfr. Part No.ST16C2550IQ48-F
BrandMaxLinear
HK$77.15
Each
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. 170-4449
Mfr. Part No.ST16C554DCJ68-F
BrandMaxLinear
HK$94.919
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 - - -
RS Stock No. 189-7769
Mfr. Part No.MAX14830ETM+
HK$168.421
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 - - -
RS Stock No. 170-9070
Mfr. Part No.FT2232HL
BrandFTDI Chip
HK$55.378
Each (On a Reel of 1000)
units
2 RS232, RS422, RS485 - - 480Mbit/s - Surface Mount LQFP 64 - 10 x 10 x 1.4mm - - -
RS Stock No. 216-8418
Mfr. Part No.FT200XD-T
BrandFTDI Chip
HK$21.204
Each (In a Pack of 5)
units
- - 512B 512B 3.4Mbps - - DFN 10 +3.3 → 5.25 V - - - -
RS Stock No. 686-5957
Mfr. Part No.ST16C554DIQ64-F
BrandMaxLinear
HK$128.13
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 - - -
RS Stock No. 725-8846
Mfr. Part No.SC16IS752IPW,112
BrandNXP
HK$49.28
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 - - -
RS Stock No. 190-1253
Mfr. Part No.MAX3100CEE+
HK$69.465
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 - - -
RS Stock No. 189-7770
Mfr. Part No.MAX3100CEE+
HK$55.944
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 - - -
RS Stock No. 913-4238
Mfr. Part No.ST16C554DIQ64-F
BrandMaxLinear
HK$94.011
Each (In a Tray of 160)
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 - - -
RS Stock No. 700-4380
Mfr. Part No.XR21V1414IM48-F
BrandEXAR
HK$83.20
Each
units
4 - - - - - Surface Mount TQFP 48 - 7 x 7 x 1mm - - -
RS Stock No. 757-0036
Mfr. Part No.FT221XS-R
BrandFTDI Chip
HK$28.435
Each (In a Pack of 2)
units
1 SIE, UART 512B 512B 1Mbit/s Yes Surface Mount SSOP 20 5 V 0.344 x 0.157 x 0.059in - - -
RS Stock No. 913-4222
Mfr. Part No.ST16C2552CJ44TR-F
BrandMaxLinear
HK$54.728
Each (On a Reel of 500)
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 - - -
RS Stock No. 170-4469
Mfr. Part No.XR21V1414IM48-F
BrandEXAR
HK$59.472
Each (In a Tray of 250)
units
4 - - - - - Surface Mount TQFP 48 - 7 x 7 x 1mm - - -
RS Stock No. 170-4580
Mfr. Part No.XR16C850CM-F
BrandMaxLinear
HK$83.91
Each (In a Tray of 250)
units
1 IrDA, RS232, RS422, RS485 - - 2Mbit/s Yes Surface Mount TQFP 48 3.3 V, 5 V 7.1 x 7.1 x 1.05mm - - -
RS Stock No. 203-5826
Mfr. Part No.MAX17841BGUE/V+
HK$62.189
Each (In a Tube of 96)
units
1 UART - - 2Mbps - - TSSOP 16 3.1 → 3.5 V - - - -