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. 200-1778
Mfr. Part No.FT230XQ-T
BrandFTDI Chip
MYR10.583
Each (In a Pack of 4)
units
1 RS232, RS422, RS485, SIE, UART - - 3Mbps - - QFN 16 5 V - - - -
RS Stock No. 686-5888
Mfr. Part No.ST16C2550CQ48-F
BrandMaxLinear
MYR31.98
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 7.1mm 7.1mm 1.05mm
RS Stock No. 170-4451
Mfr. Part No.ST16C554CQ64-F
BrandEXAR
MYR35.30
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 10.1mm 10.1mm 1.45mm
RS Stock No. 165-9902
Mfr. Part No.SC16C654DBIB64,151
BrandNXP
MYR32.129
Each (In a Tray of 160)
units
4 UART 64B 64B 5Mbit/s Yes Surface Mount LQFP 64 2.5 V, 3.3 V, 5 V 10.1 x 10.1 x 1.45mm 10.1mm 10.1mm 1.45mm
RS Stock No. 814-4032
Mfr. Part No.TIR1000PSR
MYR6.536
Each (On a Tape of 5)
units
- - - - - - Surface Mount SOIC 8 - 6.5 x 5.6 x 1.85mm 6.5mm 5.6mm 1.85mm
RS Stock No. 913-4238
Mfr. Part No.ST16C554DIQ64-F
BrandMaxLinear
MYR36.563
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 10.1mm 10.1mm 1.45mm
RS Stock No. 662-3921
Mfr. Part No.TL16C550CPTR
MYR17.06
Each (In a Pack of 5)
units
1 - 16B 16B 1MBd Yes Surface Mount LQFP 48 3 → 5.25 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 170-4466
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
MYR16.20
Each (In a Tray of 490)
units
- - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm 5mm 5mm 0.88mm
New
RS Stock No. 203-5827
Mfr. Part No.MAX17841BGUE/V+
MYR36.00
Each
units
1 UART - - 2Mbps - - TSSOP 16 3.1 → 3.5 V - - - -
New
RS Stock No. 203-5826
Mfr. Part No.MAX17841BGUE/V+
MYR25.641
Each (In a Tube of 96)
units
1 UART - - 2Mbps - - TSSOP 16 3.1 → 3.5 V - - - -
RS Stock No. 190-1312
Mfr. Part No.MAX3100EEE+
MYR34.85
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
RS Stock No. 170-9074
Mfr. Part No.FT220XS-R
BrandFTDI Chip
MYR6.212
Each (On a Reel of 3000)
units
1 SIE, UART 512B 512B 500kbit/s Yes Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in 5mm 0.157in 1.5mm
RS Stock No. 816-0239
Mfr. Part No.SC16IS762IPW,112
BrandNXP
MYR21.863
Each (In a Pack of 3)
units
2 IrDA, UART - - 5Mbit/s Yes Surface Mount TSSOP 28 2.5 V, 3.3 V 9.8 x 4.5 x 0.95mm 9.8mm 4.5mm 0.95mm
RS Stock No. 200-1781
Mfr. Part No.FT230XS-U
BrandFTDI Chip
MYR10.583
Each (In a Pack of 4)
units
1 RS232, RS422, RS485, SIE, UART - - 3Mbps - - SSOP 16 5 V - - - -
RS Stock No. 923-1600
Mfr. Part No.FT221XS-R
BrandFTDI Chip
MYR10.02
Each (On a Reel of 3000)
units
1 SIE, UART 512B 512B 1Mbit/s Yes Surface Mount SSOP 20 5 V 0.344 x 0.157 x 0.059in 8.74mm 0.157in 1.5mm
RS Stock No. 346-6863
Mfr. Part No.TL16C550CPT
MYR20.49
Each
units
1 - 16B 16B 1MBd Yes Surface Mount LQFP 48 3 → 5.25 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 686-5884
Mfr. Part No.ST16C2550CJ44-F
BrandMaxLinear
MYR30.92
Each
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 16.66mm 16.66mm 3.68mm
RS Stock No. 847-2908
Mfr. Part No.XR16C850CM-F
BrandMaxLinear
MYR50.31
Each
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 7.1mm 7.1mm 1.05mm
RS Stock No. 686-5948
Mfr. Part No.ST16C554CQ64-F
BrandMaxLinear
MYR46.05
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 10.1mm 10.1mm 1.45mm
RS Stock No. 162-8368
Mfr. Part No.TIR1000PSR
MYR8.424
Each (On a Reel of 2000)
units
- - - - - - Surface Mount SOIC 8 - 6.5 x 5.6 x 1.85mm 6.5mm 5.6mm 1.85mm
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