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. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
TWD34.70
Each (In a Tube of 15)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
TWD43.80
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 887-7381
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
TWD29.70
Each (In a Tube of 27)
units
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS Stock No. 819-5575
Mfr. Part No.MCP23S17T-E/SS
BrandMicrochip
TWD34.60
Each (On a Reel of 2100)
units
16 Serial-SPI 28 SSOP 10MHz Surface Mount 5.5 V 4.5 V
RS Stock No. 887-7319
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
TWD31.50
Each (In a Tube of 47)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 403-816
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
TWD41.60
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 669-6452
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
TWD43.40
Each (In a Pack of 5)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 403-894
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
TWD39.00
Each (In a Pack of 5)
units
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS Stock No. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
TWD31.10
Each (In a Tube of 27)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 823-3523
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
TWD40.90
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
TWD32.90
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
TWD43.50
Each (In a Pack of 2)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 889-5128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
TWD30.10
Each (In a Tube of 47)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 165-4811
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
TWD51.50
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS Stock No. 145-8960
Mfr. Part No.MCP23018-E/SP
BrandMicrochip
TWD42.20
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 3.4MHz Through Hole - -
RS Stock No. 177-2846
Mfr. Part No.MCP23017T-E/ML
BrandMicrochip
TWD36.80
Each (On a Reel of 1600)
units
16 I2C 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 178-3989
Mfr. Part No.MCP23S18-E/MJ
BrandMicrochip
TWD46.10
Each (In a Tube of 91)
units
16 Serial-SPI 24 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 770-9704
Mfr. Part No.MCP23008-E/ML
BrandMicrochip
TWD35.60
Each (In a Pack of 5)
units
8 I2C 20 QFN 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 403-636
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
TWD37.20
Each (In a Pack of 5)
units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 687-8770
Mfr. Part No.MCP23S08-E/SS
BrandMicrochip
TWD40.00
Each
units
8 SPI 20 SSOP 10MHz Surface Mount - -