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. 403-642
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
£0.816
Each (In a Pack of 5)
Units
8 I2C, Serial 18 SOIC 5MHz Surface Mount - - -
RS Stock No. 125-4197
Mfr. Part No.CY8C9520A-24PVXI
£4.22
Each (In a Pack of 2)
Units
20 I2C 28 SSOP 100kHz Surface Mount 5.25 V 3 V -
RS Stock No. 403-636
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
£0.954
Each (In a Pack of 5)
Units
8 SPI 18 PDIP 10MHz Through Hole - - -
RS Stock No. 144-5721
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
£0.725
Each (In a Tube of 25)
Units
8 SPI 18 PDIP 10MHz Through Hole - - -
RS Stock No. 403-812
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
£0.912
Each (In a Pack of 5)
Units
8 SPI 18 SOIC 10MHz Surface Mount - - -
RS Stock No. 889-5285
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
£0.725
Each (In a Tube of 42)
Units
8 SPI 18 SOIC 10MHz Surface Mount - - -
RS Stock No. 483-7109
Mfr. Part No.PCA9535D,112
BrandNXP
£1.542
Each (In a Pack of 5)
Units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount - - -
RS Stock No. 103-5690
Mfr. Part No.PCA9535D,112
BrandNXP
£1.299
Each (In a Tube of 30)
Units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount - - -
RS Stock No. 124-2352
Mfr. Part No.PCA9539PW,112
BrandNXP
£0.911
Each (In a Tube of 63)
Units
- I2C, SMBus 24 TSSOP - Surface Mount - - -
RS Stock No. 168-5139
Mfr. Part No.PCF8574PW
£0.817
Each (In a Tube of 70)
Units
- I2C 20 TSSOP - Surface Mount - - -
RS Stock No. 517-0700
Mfr. Part No.PCF8574PW
£1.53
Each (In a Pack of 5)
Units
- I2C 20 TSSOP - Surface Mount - - -
RS Stock No. 145-8960
Mfr. Part No.MCP23018-E/SP
BrandMicrochip
£1.15
Each (In a Tube of 15)
Units
16 I2C 28 SPDIP 3.4MHz Through Hole - - -
RS Stock No. 669-6455
Mfr. Part No.MCP23018-E/SP
BrandMicrochip
£1.266
Each (In a Pack of 5)
Units
16 I2C 28 SPDIP 3.4MHz Through Hole - - -
RS Stock No. 178-9133
Mfr. Part No.PCF8574DW
£1.244
Each (In a Tube of 40)
Units
- I2C 16 SOIC - Surface Mount - - -
RS Stock No. 911-5631
Mfr. Part No.MCP23017-E/ML
BrandMicrochip
£0.899
Each (In a Tube of 61)
Units
16 I2C 28 QFN 1.7MHz Surface Mount - - -
RS Stock No. 517-0671
Mfr. Part No.PCF8574DW
£1.56
Each (In a Pack of 5)
Units
- I2C 16 SOIC - Surface Mount - - -
RS Stock No. 165-4811
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
£1.21
Each (In a Tube of 15)
Units
16 I2C 28 SPDIP 400MHz Through Hole - - -
New
RS Stock No. 204-3897
Mfr. Part No.MCP23017-E/ML
BrandMicrochip
£1.07
Each (In a Pack of 5)
Units
16 I2C 28 QFN 1.7MHz Surface Mount - - -
RS Stock No. 681-1143
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
£1.33
Each (In a Pack of 2)
Units
16 I2C 28 SPDIP 400MHz Through Hole - - -
RS Stock No. 103-8078
Mfr. Part No.PCA9555BS,118
BrandNXP
£0.849
Each (On a Reel of 6000)
Units
16 I2C, SMBus 24 HVQFN 400kHz Surface Mount - - -