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庫存編號 786-0907
製造零件編號MAX14830ETM+
HK$170.11
單位
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庫存編號 923-7661
製造零件編號MAX14830ETM+
HK$147.964
毎管:43 個
單位
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庫存編號 686-6055
製造零件編號XR82C684CJ/44-F
BrandEXAR
HK$114.05
單位
4 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS庫存編號 913-4250
製造零件編號XR82C684CJ/44-F
BrandEXAR
HK$100.499
毎管:27 個
單位
4 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS庫存編號 923-1597
製造零件編號FT230XQ-R
BrandFTDI Chip
HK$13.817
個 (在毎卷:5000)
單位
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount QFN 16 5 V 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS庫存編號 757-0026
製造零件編號FT230XQ-R
BrandFTDI Chip
HK$17.16
/個 (每包:2個)
單位
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount QFN 16 5 V 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS庫存編號 888-8716
製造零件編號FT230XQ-T
BrandFTDI Chip
HK$13.585
/個 (每包:10個)
單位
- - - - - - Surface Mount QFN 16 - 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS庫存編號 162-7086
製造零件編號TL16C554FNR
HK$72.864
個 (在毎卷:250)
單位
4 - 16B 16B 1MBd Yes Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS庫存編號 662-3946
製造零件編號TL16C554FNR
HK$73.71
單位
4 - 16B 16B 1MBd Yes Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS庫存編號 162-7085
製造零件編號TL16C554AIPN
HK$69.586
毎管:119 個
單位
4 - 16B 16B 1MBd Yes Surface Mount LQFP 80 5 V 12 x 12 x 1.4mm 12mm 12mm 1.4mm
RS庫存編號 769-5620
製造零件編號XR88C681J-F
BrandEXAR
HK$77.63
單位
2 RS232, RS422, RS485 1B 3B 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 4.57mm 16.66mm 16.66mm 4.57mm
RS庫存編號 786-1001
製造零件編號MAX3140CEI+
HK$58.29
單位
1 RS422, RS485 - - 230kBd - Surface Mount QSOP 28 4.75 → 5.25 V 9.98 x 3.99 x 1.5mm 9.98mm 3.99mm 1.5mm
RS庫存編號 170-4466
製造零件編號XR21V1412IL32-F
BrandEXAR
HK$33.89
Each (In a Tray of 490)
單位
- - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm 5mm 5mm 0.88mm
RS庫存編號 170-4449
製造零件編號ST16C554DCJ68-F
BrandEXAR
HK$72.14
毎管:19 個
單位
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庫存編號 170-4467
製造零件編號XR17V358IB176-F
BrandEXAR
HK$111.33
Each (In a Tray of 160)
單位
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
RS庫存編號 686-6001
製造零件編號XR16L788IQ-F
BrandEXAR
HK$239.37
單位
8 IrDA 64B 64B 6.25Mbit/s Yes Surface Mount PQFP 100 2.97 → 5.5 V 20.1 x 14.1 x 3.05mm 20.1mm 14.1mm 3.05mm
RS庫存編號 797-4737
製造零件編號SC16C2550BIB48,151
BrandNXP
HK$51.81
單位
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庫存編號 814-4032
製造零件編號TIR1000PSR
HK$14.06
Each (On a Tape of 5)
單位
- - - - - - Surface Mount SOIC 8 - 6.5 x 5.6 x 1.85mm 6.5mm 5.6mm 1.85mm
RS庫存編號 170-4446
製造零件編號ST16C550CQ48-F
BrandEXAR
HK$29.01
Each (In a Tray of 250)
單位
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
全新
RS庫存編號 190-1465
製造零件編號MAX14830ETM+
HK$133.37
單位
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