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
$2.286
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
$1.732
Each (In a Tube of 15)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
$2.014
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
$2.60
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 889-5128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
$1.43
Each (In a Tube of 47)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 681-1128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
$2.205
Each (In a Pack of 2)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 403-563
Mfr. Part No.MCP23008-E/P
BrandMicrochip
$1.956
Each (In a Pack of 5)
units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
$1.40
Each (In a Tube of 25)
units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 145-8960
Mfr. Part No.MCP23018-E/SP
BrandMicrochip
$1.791
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 3.4MHz Through Hole - -
RS Stock No. 403-636
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
$1.822
Each (In a Pack of 5)
units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 669-6455
Mfr. Part No.MCP23018-E/SP
BrandMicrochip
$2.664
Each (In a Pack of 5)
units
16 I2C 28 SPDIP 3.4MHz Through Hole - -
RS Stock No. 144-5721
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
$1.292
Each (In a Tube of 25)
units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 823-3523
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
$2.167
Each (In a Pack of 10)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 912-6833
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
$1.429
Each (In a Tube of 15)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 770-9707
Mfr. Part No.MCP23008-E/SS
BrandMicrochip
$1.408
Each (In a Pack of 5)
units
8 I2C 20 SSOP 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 403-642
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
$2.232
Each (In a Pack of 5)
units
8 I2C, Serial MHz 18 SOIC 5MHz Surface Mount - -
RS Stock No. 889-5323
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
$1.298
Each (In a Tube of 42)
units
8 I2C, Serial MHz 18 SOIC 5MHz Surface Mount - -
RS Stock No. 165-2044
Mfr. Part No.MCP23008-E/SS
BrandMicrochip
$1.493
Each (In a Tube of 67)
units
8 I2C 20 SSOP 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 887-7319
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
$1.816
Each (In a Tube of 47)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 165-4811
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
$2.133
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 400MHz Through Hole - -