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

TCA9555PWR IC XPND 400KHZ I2C SMBUS 24TSSOP Texas Instruments	18,430 In Stock	1 : ¥11.56000 Cut Tape (CT) 2,000 : ¥4.90444 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
TCA9535PWR IC XPND 400KHZ I2C SMBUS 24TSSOP Texas Instruments	3,258 In Stock	1 : ¥11.49000 Cut Tape (CT) 2,000 : ¥4.89145 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
TCA9539QPWRQ1 IC XPND 400KHZ I2C SMBUS 24TSSOP Texas Instruments	3,609 In Stock	1 : ¥18.55000 Cut Tape (CT) 2,000 : ¥8.49629 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 ~ 3.6V	-40°C ~ 125°C	Automotive	AEC-Q100	Surface Mount	24-TSSOP (0.173", 4.40mm Width)	24-TSSOP
PCF8575PWR IC XPND 400KHZ I2C SMBUS 24TSSOP Texas Instruments	12,986 In Stock	1 : ¥20.03000 Cut Tape (CT) 2,000 : ¥9.17914 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	I2C, SMBus	Yes	POR	Push-Pull	1mA, 25mA	400 kHz	2.5V ~ 5.5V	-40°C ~ 85°C	-	-	Surface Mount	24-TSSOP (0.173", 4.40mm Width)	24-TSSOP
MAX7318AUG+T IC XPND 400KHZ I2C SMBUS 24TSSOP Analog Devices Inc./Maxim Integrated	1,823 In Stock	1 : ¥49.75000 Cut Tape (CT) 2,500 : ¥28.12848 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	I2C, SMBus	Yes	POR	Push-Pull	31mA, 43mA	400 kHz	2V ~ 5.5V	-40°C ~ 125°C	-	-	Surface Mount	24-TSSOP (0.173", 4.40mm Width)	24-TSSOP
PI4IOE5V6416LEX IC XPNDR 400KHZ I2C 24TSSOP Diodes Incorporated	23,078 In Stock 15,000 Factory	1 : ¥8.93000 Cut Tape (CT) 3,000 : ¥5.31326 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	I2C	Yes	POR	Open Drain, 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
MAX7311AWG+ IC XPNDR 400KHZ I2C SMBUS 24SOIC Analog Devices Inc./Maxim Integrated	732 In Stock 24,420 Factory	1 : ¥75.41000 Tube	-	Tube	Active	Not Verified	16	I2C, SMBus	Yes	POR	Push-Pull	31mA, 43mA	400 kHz	2V ~ 5.5V	-40°C ~ 125°C	-	-	Surface Mount	24-SOIC (0.295", 7.50mm Width)	24-SOIC
PCA9535EDTR2G IC XPND 100KHZ I2C SMBUS 24TSSOP onsemi	3,100 In Stock	1 : ¥23.48000 Cut Tape (CT) 2,500 : ¥11.32368 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Obsolete	Not Verified	16	I2C, SMBus	Yes	POR	Push-Pull	10mA, 25mA	100 kHz	1.65V ~ 5.5V	-55°C ~ 125°C	-	-	Surface Mount	24-TSSOP (0.173", 4.40mm Width)	24-TSSOP
PCA9655EDTR2G IC XPND 100KHZ I2C SMBUS 24TSSOP onsemi	0 In Stock	1 : ¥25.04000 Cut Tape (CT) 2,500 : ¥12.11124 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Obsolete	Not Verified	16	I2C, SMBus	Yes	POR	Push-Pull	42mA	100 kHz	1.65V ~ 5.5V	-55°C ~ 125°C	-	-	Surface Mount	24-TSSOP (0.173", 4.40mm Width)	24-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.