I/O Expanders

I/O expandersare a type of computer hardware that allows more than one device to connect to a single port on a computer.

How do I/O expanders work?

The expander connects to a single spot, but has multiple connections for other devices. Such expanders offer the advantage of allowing more devices of a particular port type to be used at the same time. This commonly used with USBs and ethernet ports.

Types of I/O expanders

There are two main types of I/O expanders: internal and external.

Internal expanders

These have a connection inside the computer, typically on the motherboard, and the only part the user can see is the expansion plate which houses the ports to which they can connect more devices.

External expanders

An external expander plugs into an existing port introducing multiple new places to connect. When not part of a computer system, these devices are commonly known as splitters.


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Description Price Number of I/O Channels Interface Number of Pins Package Type Clock Frequency Mounting Type Maximum Supply Voltage Minimum Supply Voltage
RS stock no. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
R 35.902
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS stock no. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
R 20.827
Each (In a Tube of 15)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS stock no. 887-7381
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
R 17.907
Each (In a Tube of 27)
units
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS stock no. 403-894
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
R 31.088
Each (In a Pack of 5)
units
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS stock no. 912-6833
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
R 25.184
Each (In a Tube of 15)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS stock no. 889-5128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
R 17.705
Each (In a Tube of 47)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS stock no. 823-3523
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
R 21.657
Each (In a Pack of 10)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS stock no. 681-1128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
R 31.62
Each (In a Pack of 2)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS stock no. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
R 17.30
Each (In a Tube of 27)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS stock no. 403-816
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
R 34.136
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS stock no. 511-068
Mfr. Part No.PCA9698DGG,512
BrandNXP
R 82.94
Each
units
40 - 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS stock no. 124-2361
Mfr. Part No.PCA9698DGG,512
BrandNXP
R 70.364
Each (In a Tube of 35)
units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS stock no. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
R 15.794
Each (In a Tube of 25)
units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS stock no. 403-563
Mfr. Part No.MCP23008-E/P
BrandMicrochip
R 24.098
Each (In a Pack of 5)
units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS stock no. 517-0249
Mfr. Part No.PCF8574AN
R 24.79
Each
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS stock no. 889-5323
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
R 14.451
Each (In a Tube of 42)
units
8 I2C, Serial MHz 18 SOIC 5MHz Surface Mount - -
RS stock no. 403-642
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
R 17.162
Each (In a Pack of 5)
units
8 I2C, Serial MHz 18 SOIC 5MHz Surface Mount - -
RS stock no. 920-3374
Mfr. Part No.PCF8574AN
R 20.775
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS stock no. 124-2352
Mfr. Part No.PCA9539PW,112
BrandNXP
R 17.385
Each (In a Tube of 63)
units
- - 24 TSSOP - Surface Mount - -
RS stock no. 510-841
Mfr. Part No.PCA9539PW,112
BrandNXP
R 45.204
Each (In a Pack of 5)
units
- - 24 TSSOP - Surface Mount - -