Interface - I/O Expanders

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MCP23x17 I/O Expanders

Microchip Technology MCP23x17 I/O Expanders feature a 16-bit general-purpose parallel bi-directional I/O port with a high-speed I²C interface. These I/O expanders come with three hardware address pins that allow up to eight devices on the bus and configurable interrupt output pins. The hardware pins are used to determine the device address. The MCP23x17 expanders consist of multiple 8-bit configuration registers for input, output, and polarity selection. These MCP23x17 I/O expanders offer two interrupt pins, INTA and INTB, that will activate if either port causes an interrupt.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (CAD) Filter the results in the table by unit price based on your quantity.	Qty.	Series	Mounting Style	Package / Case	Interface Type	Number of I/Os	Interrupt Output	Supply Voltage - Min	Supply Voltage - Max	Maximum Clock Frequency	Minimum Operating Temperature	Maximum Operating Temperature	Packaging	ESD Protection
Interface - I/O Expanders 16bit Input/Output Exp I2C interface MCP23017-E/ML Microchip Technology 1: $2.74 45,256In Stock	Mfr. Part # MCP23017-E/ML Mouser Part # 579-MCP23017-E/ML	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp I2C interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	45,256In Stock	$2.74 $2.29 $2.07	Min.: 1 Mult.: 1	MCP23017	SMD/SMT	QFN-28	I2C, Serial	16 I/O	With Interrupt	1.8 V	5.5 V	1.7 MHz	- 40 C	+ 125 C	Tube	4 kV
Interface - I/O Expanders 16bit Input/Output Exp SPI interface MCP23S17-E/SO Microchip Technology 1: $2.43 33,083In Stock	Mfr. Part # MCP23S17-E/SO Mouser Part # 579-MCP23S17-E/SO	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp SPI interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	33,083In Stock	$2.43 $2.02 $1.84	Min.: 1 Mult.: 1	MCP23S17	SMD/SMT	SOIC-28	Serial, SPI	16 I/O	With Interrupt	1.8 V	5.5 V	10 MHz	- 40 C	+ 125 C	Tube	4 kV
Interface - I/O Expanders 16bit Input/Output Exp SPI interface MCP23S17-E/SP Microchip Technology 1: $2.56 10,909In Stock	Mfr. Part # MCP23S17-E/SP Mouser Part # 579-MCP23S17-E/SP	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp SPI interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	10,909In Stock	$2.56 $2.15 $1.94	Min.: 1 Mult.: 1	MCP23S17	Through Hole	SPDIP-28	Serial, SPI	16 I/O	With Interrupt	1.8 V	5.5 V	10 MHz	- 40 C	+ 125 C	Tube	4 kV
Interface - I/O Expanders 16bit Input/Output Exp SPI interface MCP23S17-E/SS Microchip Technology 1: $2.56 20,159In Stock	Mfr. Part # MCP23S17-E/SS Mouser Part # 579-MCP23S17-E/SS	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp SPI interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	20,159In Stock	$2.56 $2.15 $1.94	Min.: 1 Mult.: 1	MCP23S17	SMD/SMT	SSOP-28	Serial, SPI	16 I/O	With Interrupt	1.8 V	5.5 V	10 MHz	- 40 C	+ 125 C	Tube	4 kV
Interface - I/O Expanders 16bit Input/Output Exp SPI interface MCP23S17T-E/ML Microchip Technology 1: $2.94 42,401In Stock	Mfr. Part # MCP23S17T-E/ML Mouser Part # 579-MCP23S17T-E/ML	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp SPI interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	42,401In Stock	Cut Tape $2.94 $2.43 Reel $2.22 MouseReel Available	Min.: 1 Mult.: 1 : 1,600	MCP23S17	SMD/SMT	QFN-28	Serial, SPI	16 I/O	With Interrupt	4.5 V	5.5 V	10 MHz	- 40 C	+ 125 C	Reel, Cut Tape, MouseReel	4 kV
Interface - I/O Expanders 16bit Input/Output Exp SPI interface MCP23S17T-E/SO Microchip Technology 1: $2.43 21,318In Stock	Mfr. Part # MCP23S17T-E/SO Mouser Part # 579-MCP23S17T-E/SO	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp SPI interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	21,318In Stock	Cut Tape $2.43 $2.02 Reel $1.84 MouseReel Available	Min.: 1 Mult.: 1 : 1,600	MCP23S17	SMD/SMT	SOIC-28	Serial, SPI	16 I/O	With Interrupt	1.8 V	5.5 V	10 MHz	- 40 C	+ 125 C	Reel, Cut Tape, MouseReel	4 kV
Interface - I/O Expanders 16bit Input/Output Exp SPI interface MCP23S17T-E/SS Microchip Technology 1: $2.56 21,278In Stock 23,100Expected 2026-11-17	Mfr. Part # MCP23S17T-E/SS Mouser Part # 579-MCP23S17T-E/SS	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp SPI interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	21,278In Stock 23,100Expected 2026-11-17	Cut Tape $2.56 $2.15 Reel $1.94 MouseReel Available	Min.: 1 Mult.: 1 : 2,100	MCP23S17	SMD/SMT	SSOP-28	Serial, SPI	16 I/O	With Interrupt	1.8 V	5.5 V	10 MHz	- 40 C	+ 125 C	Reel, Cut Tape, MouseReel	4 kV
Interface - I/O Expanders 16bit Input/Output Exp I2C interface MCP23017-E/SO Microchip Technology 1: $2.33 37,037In Stock	Mfr. Part # MCP23017-E/SO Mouser Part # 579-MCP23017-E/SO	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp I2C interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	37,037In Stock	$2.33 $1.94 $1.79	Min.: 1 Mult.: 1	MCP23017	SMD/SMT	SOIC-28	I2C, Serial	16 I/O	With Interrupt	1.8 V	5.5 V	1.7 MHz	- 40 C	+ 125 C	Tube	4 kV
Interface - I/O Expanders 16bit Input/Output Exp I2C interface MCP23017-E/SS Microchip Technology 1: $2.43 16,021In Stock 6,855Expected 2026-10-12	Mfr. Part # MCP23017-E/SS Mouser Part # 579-MCP23017-E/SS	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp I2C interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	16,021In Stock 6,855Expected 2026-10-12	$2.43 $2.02 $1.84	Min.: 1 Mult.: 1	MCP23017	SMD/SMT	SSOP-28	I2C, Serial	16 I/O	With Interrupt	1.8 V	5.5 V	1.7 MHz	- 40 C	+ 125 C	Tube	4 kV
Interface - I/O Expanders 16bit Input/Output Exp I2C interface MCP23017T-E/ML Microchip Technology 1: $2.74 23,279In Stock	Mfr. Part # MCP23017T-E/ML Mouser Part # 579-MCP23017T-E/ML	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp I2C interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	23,279In Stock	Cut Tape $2.74 $2.29 Reel $2.07 MouseReel Available	Min.: 1 Mult.: 1 : 1,600	MCP23017	SMD/SMT	QFN-28	I2C, Serial	16 I/O	With Interrupt	1.8 V	5.5 V	1.7 MHz	- 40 C	+ 125 C	Reel, Cut Tape, MouseReel	4 kV
Interface - I/O Expanders 16bit Input/Output Exp I2C interface MCP23017T-E/SS Microchip Technology 1: $2.43 54,389In Stock	Mfr. Part # MCP23017T-E/SS Mouser Part # 579-MCP23017T-E/SS	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp I2C interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	54,389In Stock	Cut Tape $2.43 $2.02 Reel $1.84 MouseReel Available	Min.: 1 Mult.: 1 : 2,100	MCP23017	SMD/SMT	SSOP-28	I2C, Serial	16 I/O	With Interrupt	1.8 V	5.5 V	1.7 MHz	- 40 C	+ 125 C	Reel, Cut Tape, MouseReel	4 kV
Interface - I/O Expanders 16bit Input/Output Exp SPI interface MCP23S17-E/ML Microchip Technology 1: $2.94 4,816In Stock 9,760Expected 2026-12-03	Mfr. Part # MCP23S17-E/ML Mouser Part # 579-MCP23S17-E/ML	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp SPI interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	4,816In Stock 9,760Expected 2026-12-03	$2.94 $2.43 $2.22	Min.: 1 Mult.: 1	MCP23S17	SMD/SMT	QFN-28	Serial, SPI	16 I/O	With Interrupt	1.8 V	5.5 V	10 MHz	- 40 C	+ 125 C	Tube	4 kV
Interface - I/O Expanders 16bit Input/Output Exp I2C interface MCP23017-E/SP Microchip Technology 1: $2.43 4,501In Stock 7,500Expected 2026-10-13	Mfr. Part # MCP23017-E/SP Mouser Part # 579-MCP23017-E/SP	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp I2C interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	4,501In Stock 7,500Expected 2026-10-13	$2.43 $2.02 $1.84	Min.: 1 Mult.: 1	MCP23017	Through Hole	SPDIP-28	I2C, Serial	16 I/O	With Interrupt	1.8 V	5.5 V	1.7 MHz	- 40 C	+ 125 C	Tube	4 kV
Interface - I/O Expanders 16bit Input/Output Exp I2C interface MCP23017T-E/SO Microchip Technology 1: $2.33 10,782In Stock 16,000Expected 2026-10-16	Mfr. Part # MCP23017T-E/SO Mouser Part # 579-MCP23017T-E/SO	Microchip Technology	Interface - I/O Expanders 16bit Input/Output Exp I2C interface Learn More about Microchip Technology microchip mcp23x17 io expanders	Datasheet	10,782In Stock 16,000Expected 2026-10-16	Cut Tape $2.33 $1.94 Reel $1.79 MouseReel Available	Min.: 1 Mult.: 1 : 1,600	MCP23017	SMD/SMT	SOIC-28	I2C, Serial	16 I/O	With Interrupt	1.8 V	5.5 V	1.7 MHz	- 40 C	+ 125 C	Reel, Cut Tape, MouseReel	4 kV

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