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. 166-0323
Mfr. Part No.SC16C550BIB48,128
BrandNXP
€1.276
Each (On a Reel of 2000)
units
1 UART 16B 16B 3Mbit/s - Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 170-4454
Mfr. Part No.XR16C2850CM-F
BrandEXAR
€10.37
Each (In a Tray of 250)
units
2 IrDA 128B 128B 6.25Mbit/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. 484-1445
Mfr. Part No.SC28L92A1B,551
BrandNXP
€8.59
Each
units
2 - 16B 16B 0.23MBd - Surface Mount PQFP 44 2.97 → 5.5 V 10 x 10 x 1.75mm 10mm 10mm 1.75mm
RS Stock No. 170-4469
Mfr. Part No.XR21V1414IM48-F
BrandEXAR
€4.748
Each (In a Tray of 250)
units
- - - - - - Surface Mount TQFP 48 - 7 x 7 x 1mm 7mm 7mm 1mm
RS Stock No. 686-6067
Mfr. Part No.XR88C681CJ-F
BrandEXAR
€7.35
Each
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. 190-1351
Mfr. Part No.MAX3107ETG+
€6.01
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. 686-5998
Mfr. Part No.XR16L784CV-F
BrandEXAR
€11.74
Each
units
4 IrDA 64B 64B 6.25Mbit/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. 170-4448
Mfr. Part No.ST16C552CJ68-F
BrandEXAR
€6.172
Each (In a Tube of 19)
units
2 - 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. 913-4216
Mfr. Part No.ST16C2550CJ44-F
BrandEXAR
€3.174
Each (In a Tube of 27)
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. 799-2849
Mfr. Part No.MAX3109ETJ+
€6.68
Each
units
1 RS232, RS485 - - 24Mbit/s Yes Surface Mount TQFN 32 1.71 to 3.6 V 5.0 x 5.0 x 0.43mm 5mm 5.0mm 0.43mm
RS Stock No. 686-6023
Mfr. Part No.XR17V258IV-F
BrandEXAR
€34.74
Each
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. 700-4371
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
€5.17
Each
units
- - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm 5mm 5mm 0.88mm
RS Stock No. 923-1584
Mfr. Part No.FT232HL-REEL
BrandFTDI Chip
€2.529
Each (On a Reel of 1500)
units
1 RS232, RS422, RS485 UART - - 12Mbit/s - Surface Mount LQFP 48 1.8 V, 3.3 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 797-4753
Mfr. Part No.SC16C752BIB48,151
BrandNXP
€5.73
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. 170-4453
Mfr. Part No.ST16C554DIJ68-F
BrandEXAR
€10.336
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. 531-2500
Mfr. Part No.TL16C552AFN
€6.59
Each
units
2 - 16B 16B 1MBd - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 170-4514
Mfr. Part No.ST16C654IJ68-F
BrandEXAR
€12.818
Each (In a Tube of 19)
units
4 IrDA, RS232, RS422, RS485 64B 64B 1.5Mbit/s - Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 5.08mm 24.33mm 24.33mm 5.08mm
RS Stock No. 170-4468
Mfr. Part No.XR21V1410IL16-F
BrandEXAR
€2.217
Each (In a Tray of 490)
units
- - - - - - Surface Mount QFN 16 - 3 x 3 x 0.88mm 3mm 3mm 0.88mm
RS Stock No. 162-7081
Mfr. Part No.TL16C2550PFB
€3.491
Each (In a Tray of 250)
units
2 - 16B 16B 1.5MBd Yes Surface Mount TQFP 48 5 V 7 x 7 x 1mm 7mm 7mm 1mm
RS Stock No. 700-4374
Mfr. Part No.XR17V358IB176-F
BrandEXAR
€14.81
Each
units
8 IrDA 256B 256B 25Mbit/s Yes Surface Mount FBGA 176 3.3 V 13.1 x 13.1 x 1.15mm 13.1mm 13.1mm 1.15mm
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