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 Priced to Clear
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
£0.93
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
£0.929
Each (In a Tube of 15)
Units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - - -
RS Stock No. 403-563
Mfr. Part No.MCP23008-E/P
BrandMicrochip
£0.73
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
£0.704
Each (In a Tube of 25)
Units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - - -
RS Stock No. 403-816
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
£0.93
Each (In a Pack of 5)
Units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - - -
RS Stock No. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
£0.774
Each (In a Tube of 27)
Units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
£2.01
Each
Units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - - -
RS Stock No. 920-3374
Mfr. Part No.PCF8574AN
£0.951
Each (In a Tube of 25)
Units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - - -
RS Stock No. 510-780
Mfr. Part No.PCF8574T/3,512
BrandNXP
£1.156
Each (In a Pack of 5)
Units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 124-2364
Mfr. Part No.PCF8574T/3,512
BrandNXP
£0.94
Each (In a Tube of 48)
Units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 273-539
Mfr. Part No.P82B715TD,112
BrandNXP
£2.77
Each
Units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - - -
RS Stock No. 124-2337
Mfr. Part No.P82B715TD,112
BrandNXP
£2.048
Each (In a Tube of 100)
Units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - - -
RS Stock No. 823-3523
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
£0.972
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
£0.972
Each (In a Tube of 15)
Units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V -
RS Stock No. 887-7381
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
£0.813
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
£0.972
Each (In a Pack of 5)
Units
16 Serial-SPI 28 SOIC 5MHz Surface Mount - - -
RS Stock No. 770-9704
Mfr. Part No.MCP23008-E/ML
BrandMicrochip
£0.852
Each (In a Pack of 5)
Units
8 I2C 20 QFN 1.7MHz Surface Mount 5.5 V 1.8 V -
RS Stock No. 165-2077
Mfr. Part No.MCP23008-E/ML
BrandMicrochip
£0.712
Each (In a Tube of 91)
Units
8 I2C 20 QFN 1.7MHz Surface Mount 5.5 V 1.8 V -
RS Stock No. 819-5575
Mfr. Part No.MCP23S17T-E/SS
BrandMicrochip
£0.774
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
£0.851
Each (In a Tube of 47)
Units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - - -
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