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	Grade	Qualification	Mounting Type	Package / Case	Supplier Device Package

PCAL6416AHF,128 IC XPND 400KHZ I2C SMBUS 24HWQFN NXP USA Inc.	158,301 In Stock	1 : ¥13.69000 Cut Tape (CT) 6,000 : ¥5.52599 Tape & Reel (TR)	Agile	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	I2C, SMBus	Yes	POR	Open Drain, Push-Pull	10mA, 25mA	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	-	-	Surface Mount	24-WFQFN Exposed Pad	24-HWQFN (4x4)
TCA6424ARGJR IC XPNDR 400KHZ I2C SMBUS 32UQFN Texas Instruments	13,183 In Stock	1 : ¥18.11000 Cut Tape (CT) 3,000 : ¥8.28786 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	24	I2C, SMBus	Yes	POR	Push-Pull	10mA, 25mA	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	-	-	Surface Mount	32-UFQFN Exposed Pad	32-UQFN (5x5)
TCA9554APWR IC XPND 400KHZ I2C SMBUS 16TSSOP Texas Instruments	4,539 In Stock	1 : ¥11.82000 Cut Tape (CT) 2,000 : ¥4.99859 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	8	I2C, SMBus	Yes	POR	Push-Pull	10mA, 25mA	400 kHz	1.65V ~ 5.5V	-40°C ~ 85°C	-	-	Surface Mount	16-TSSOP (0.173", 4.40mm Width)	16-TSSOP

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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.