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
MCP23S17-E/SS IC XPNDR 10MHZ SPI 28SSOP Microchip Technology	2,869 In Stock	47 : $2.36745 Tube	-	Tube	Active	Not Verified	16	SPI	Yes	POR	Push-Pull	25mA	10 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Surface Mount	28-SSOP (0.209", 5.30mm Width)	28-SSOP
MCP23S17T-E/SO IC XPNDR 10MHZ SPI 28SOIC Microchip Technology	22,844 In Stock	1 : $2.69000 Cut Tape (CT) 1,600 : $2.03379 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	SPI	Yes	POR	Push-Pull	25mA	10 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Surface Mount	28-SOIC (0.295", 7.50mm Width)	28-SOIC
MCP23S17-E/ML IC XPNDR 10MHZ SPI 28QFN Microchip Technology	8,633 In Stock	61 : $2.68525 Tube	-	Tube	Active	Not Verified	16	SPI	Yes	POR	Push-Pull	25mA	10 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Surface Mount	28-VQFN Exposed Pad	28-QFN (6x6)
MCP23S17-E/SO IC XPNDR 10MHZ SPI 28SOIC Microchip Technology	5,442 In Stock	1 : $2.69000 Tube	-	Tube	Active	Not Verified	16	SPI	Yes	POR	Push-Pull	25mA	10 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Surface Mount	28-SOIC (0.295", 7.50mm Width)	28-SOIC
MCP23S17T-E/SS IC XPNDR 10MHZ SPI 28SSOP Microchip Technology	29,616 In Stock	1 : $2.83000 Cut Tape (CT) 2,100 : $2.14501 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	SPI	Yes	-	Push-Pull	25mA	10 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Surface Mount	28-SSOP (0.209", 5.30mm Width)	28-SSOP
MCP23S17-E/SP IC XPNDR 10MHZ SPI 28SDIP Microchip Technology	7,014 In Stock	1 : $2.83000 Tube	-	Tube	Active	Not Verified	16	SPI	Yes	POR	Push-Pull	25mA	10 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Through Hole	28-DIP (0.300", 7.62mm)	28-SPDIP
MCP23S17T-E/ML IC XPNDR 10MHZ SPI 28QFN Microchip Technology	36,142 In Stock	1 : $3.24000 Cut Tape (CT) 1,600 : $2.44691 Tape & Reel (TR)	-	Tape & Reel (TR) Cut Tape (CT) Digi-Reel®	Active	Not Verified	16	SPI	Yes	POR	Push-Pull	25mA	10 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	Surface Mount	28-VQFN Exposed Pad	28-QFN (6x6)

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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.