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. 923-1587
Mfr. Part No.FT232HQ-REEL
BrandFTDI Chip
MYR11.057
Each (On a Reel of 3000)
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. 686-5913
Mfr. Part No.ST16C550CJ44-F
BrandEXAR
MYR15.66
Each
units
1 - 16B 16B 1.5Mbit/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. 162-7083
Mfr. Part No.TL16C550CPTR
MYR13.45
Each (On a Reel of 1000)
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. 190-1351
Mfr. Part No.MAX3107ETG+
MYR32.65
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
RS Stock No. 913-4231
Mfr. Part No.ST16C550CJ44-F
BrandEXAR
MYR14.27
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 16.66mm 16.66mm 4.57mm
RS Stock No. 799-2836
Mfr. Part No.MAX3107EAG+
MYR27.98
Each
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
RS Stock No. 121-8680
Mfr. Part No.TL16C554APN
MYR36.05
Each (In a Tray 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. 170-4470
Mfr. Part No.XR16M890IL32-F
BrandEXAR
MYR10.76
Each (In a Tray of 490)
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 5mm 5mm 0.88mm
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
RS Stock No. 189-7773
Mfr. Part No.MAX3107EAG+
MYR27.252
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
RS Stock No. 662-3911
Mfr. Part No.TL16C452FNR
MYR27.03
Each
units
2 - - - 0.256Mbit/s - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 170-4459
Mfr. Part No.XR88C681CJ-F
BrandEXAR
MYR26.713
Each (In a Tube of 27)
units
2 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 189-7769
Mfr. Part No.MAX14830ETM+
MYR66.547
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. 170-4579
Mfr. Part No.XR16L2750CM-F
BrandEXAR
MYR22.66
Each (In a Tray of 250)
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 7.1mm 7.1mm 1.05mm
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. 913-4228
Mfr. Part No.ST16C2550IQ48-F
BrandMaxLinear
MYR19.186
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 7.1mm 7.1mm 1.05mm
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. 190-6193
Mfr. Part No.MAX3100CEE+T
MYR21.934
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
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. 769-5605
Mfr. Part No.XR20M1170IG16-F
BrandMaxLinear
MYR13.985
Each (In a Pack of 2)
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 5.1mm 4.5mm 0.95mm
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