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. 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
RS Stock No. 686-5884
Mfr. Part No.ST16C2550CJ44-F
BrandEXAR
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. 732-9140
Mfr. Part No.MAX3100CPD+
MYR33.59
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. 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. 797-4737
Mfr. Part No.SC16C2550BIB48,151
BrandNXP
MYR25.38
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 7.1mm 7.1mm 1.6mm
RS Stock No. 700-4371
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
MYR24.50
Each
units
- - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm 5mm 5mm 0.88mm
RS Stock No. 757-0014
Mfr. Part No.FT220XS-R
BrandFTDI Chip
MYR8.34
Each (In a Pack of 2)
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. 170-4513
Mfr. Part No.ST16C654DIQ64-F
BrandEXAR
MYR56.28
Each (In a Tray of 160)
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 10mm 10mm 1.4mm
RS Stock No. 686-5932
Mfr. Part No.ST16C550IQ48-F
BrandEXAR
MYR24.38
Each
units
1 - 16B 16B 1.5Mbit/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. 162-7085
Mfr. Part No.TL16C554AIPN
MYR35.13
Each (In a Tube of 119)
units
4 - 16B 16B 1MBd Yes Surface Mount LQFP 80 5 V 12 x 12 x 1.4mm 12mm 12mm 1.4mm
RS Stock No. 725-8846
Mfr. Part No.SC16IS752IPW,112
BrandNXP
MYR15.88
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 9.8mm 4.5mm 0.75mm
RS Stock No. 190-1375
Mfr. Part No.MAX3109ETJ+
MYR38.69
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 5mm 5.0mm 0.43mm
RS Stock No. 662-3915
Mfr. Part No.TL16C550CFNR
MYR19.92
Each (In a Pack of 5)
units
1 - 16B 16B 1MBd Yes Surface Mount PLCC 44 3 → 5.25 V 16.59 x 16.59 x 4.06mm 16.59mm 16.59mm 4.06mm
RS Stock No. 797-4753
Mfr. Part No.SC16C752BIB48,151
BrandNXP
MYR26.65
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 7.1mm 7.1mm 1.45mm
RS Stock No. 170-4542
Mfr. Part No.XR16V554DIV-F
BrandEXAR
MYR34.68
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 10.1mm 10.1mm 1.45mm
RS Stock No. 921-5829
Mfr. Part No.HD3-6402R-9Z
MYR93.30
Each
units
1 - - - 125kBd - Through Hole PDIP 40 5 V 53.2 x 14.73 x 4.95mm 53.2mm 14.73mm 4.95mm
RS Stock No. 170-4449
Mfr. Part No.ST16C554DCJ68-F
BrandEXAR
MYR34.48
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 24.33mm 24.33mm 3.68mm
RS Stock No. 737-7852
Mfr. Part No.FT232HQ-REEL
BrandFTDI Chip
MYR15.90
Each
units
1 RS232, RS422, RS485 UART - - 12Mbit/s - Surface Mount QFN 48 1.8 V, 3.3 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 170-4457
Mfr. Part No.XR17V258IV-F
BrandEXAR
MYR145.381
Each (In a Tube of 60)
units
8 IrDA 64B 64B 8Mbit/s Yes Surface Mount LQFP 144 3.3 V 20.1 x 20.1 x 1.45mm 20.1mm 20.1mm 1.45mm
RS Stock No. 778-0898
Mfr. Part No.XR16V554DIV-F
BrandMaxLinear
MYR46.83
Each
units
4 - 16B 16B 4Mbit/s - Surface Mount LQFP 64 2.25 → 3.6 V 10.1 x 10.1 x 1.45mm 10.1mm 10.1mm 1.45mm
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