I/O Expanders

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Mfr Part #	Quantity Available	Price	Series	Package	Product Status	DigiKey Programmable	Number of I/O	Interface	Interrupt Output	Features	Output Type	Current - Output Source/Sink	Clock Frequency	Voltage - Supply	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package

TCA9539PWR IC XPND 400KHZ I2C SMBUS 24TSSOP Texas Instruments	9,260 In Stock	1 : ¥11.65000 Cut Tape (CT) 2,000 : ¥4.95256 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	I2C, SMBus	Yes	POR	Push-Pull	10mA, 25mA	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	Surface Mount	24-TSSOP (0.173", 4.40mm Width)	24-TSSOP
TCA6416ARTWR IC XPNDR 400KHZ I2C SMBUS 24WQFN Texas Instruments	7,665 In Stock	1 : ¥14.03000 Cut Tape (CT) 3,000 : ¥6.41595 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	I2C, SMBus	Yes	POR	Push-Pull	10mA, 25mA	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	Surface Mount	24-WFQFN Exposed Pad	24-WQFN (4x4)
MCP23017-E/ML IC XPNDR 1.7MHZ I2C 28QFN Microchip Technology	7,390 In Stock	1 : ¥16.15000 Tube	-	Tube	Active	Not Verified	16	I2C	Yes	POR	Push-Pull	25mA	1.7 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Surface Mount	28-VQFN Exposed Pad	28-QFN (6x6)

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I/O Expanders

Devices in this family are used in conjunction with microcontrollers, microprocessors, or similar devices for the purpose of increasing the number of signal connections available for connecting peripheral devices. The typical concept of operation involves the use of serial communications requiring only a few I/O lines on the host device to read/write the status of many input/output pins on the expander device. The technique exchanges speed of communication for increased connectivity, and is best suited for applications where fast response is not critical, such as in many human interface applications.