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 35.952
Each (In a Pack of 5)
units
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS stock no. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
R 20.397
Each (In a Tube of 15)
units
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS stock no. 887-7381
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
R 17.533
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 31.144
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 21.312
Each (In a Tube of 15)
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 31.655
Each (In a Pack of 2)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS stock no. 823-3523
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
R 21.209
Each (In a Pack of 10)
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 17.33
Each (In a Tube of 47)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS stock no. 403-816
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
R 34.18
Each (In a Pack of 5)
units
16 I2C, Serial 28 SOIC 5MHz Surface Mount - -
RS stock no. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
R 16.94
Each (In a Tube of 27)
units
16 I2C, Serial 28 SOIC 5MHz Surface Mount - -
RS stock no. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
R 15.303
Each (In a Tube of 25)
units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS stock no. 403-563
Mfr. Part No.MCP23008-E/P
BrandMicrochip
R 24.132
Each (In a Pack of 5)
units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS stock no. 889-5323
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
R 14.148
Each (In a Tube of 42)
units
8 I2C, Serial 18 SOIC 5MHz Surface Mount - -
RS stock no. 403-642
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
R 16.80
Each (In a Pack of 5)
units
8 I2C, Serial 18 SOIC 5MHz Surface Mount - -
RS stock no. 681-1143
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
R 27.365
Each (In a Pack of 2)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS stock no. 165-4811
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
R 27.371
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS stock no. 403-812
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
R 18.734
Each (In a Pack of 5)
units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS stock no. 770-9717
Mfr. Part No.MCP23016-I/SS
BrandMicrochip
R 27.973
Each (In a Pack of 3)
units
16 I2C 28 SSOP 400kHz Surface Mount 5.5 V 2 V
RS stock no. 889-5285
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
R 15.999
Each (In a Tube of 42)
units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS stock no. 145-9007
Mfr. Part No.MCP23016-I/SS
BrandMicrochip
R 23.519
Each (In a Tube of 47)
units
16 I2C 28 SSOP 400kHz Surface Mount 5.5 V 2 V