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. 912-6833
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
kr 19,155
Each (In a Tube of 15)
Units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 823-3523
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
kr 19,079
Each (In a Pack of 10)
Units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 403-636
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
kr 17,156
Each (In a Pack of 5)
Units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 403-563
Mfr. Part No.MCP23008-E/P
BrandMicrochip
kr 16,416
Each (In a Pack of 5)
Units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
kr 14,898
Each (In a Tube of 25)
Units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS Stock No. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
kr 18,155
Each (In a Tube of 15)
Units
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS Stock No. 144-5721
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
kr 15,39
Each (In a Tube of 25)
Units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
kr 18,176
Each (In a Pack of 5)
Units
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
kr 26,63
Each
Units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 920-3374
Mfr. Part No.PCF8574AN
kr 22,50
Each (In a Tube of 25)
Units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 889-5285
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
kr 15,067
Each (In a Tube of 42)
Units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 403-812
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
kr 16,502
Each (In a Pack of 5)
Units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 273-539
Mfr. Part No.P82B715TD,112
BrandNXP
kr 59,47
Each
Units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - -
RS Stock No. 517-0671
Mfr. Part No.PCF8574DW
kr 27,744
Each (In a Pack of 5)
Units
- I2C 16 SOIC - Surface Mount - -
RS Stock No. 229-7056
Mfr. Part No.TCA9535RTWR
kr 10,206
Each (On a Reel of 3000)
Units
16 I2C, SMBus 24 WQFN 100kHz - - -
RS Stock No. 669-6458
Mfr. Part No.MCP23016-I/SO
BrandMicrochip
kr 22,656
Each (In a Pack of 5)
Units
16 I2C 28 SOIC 1MHz Surface Mount - -
RS Stock No. 727-5706
Mfr. Part No.PCA9554ABS,118
BrandNXP
kr 24,025
Each (On a Tape of 2)
Units
- I2C, SMBus - HVQFN - Surface Mount - -
RS Stock No. 177-2847
Mfr. Part No.MCP23017T-E/SO
BrandMicrochip
kr 16,172
Each (On a Reel of 1600)
Units
16 I2C 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 229-7057
Mfr. Part No.TCA9535RTWR
kr 17,83
Each (In a Pack of 5)
Units
16 I2C, SMBus 24 WQFN 100kHz - - -
RS Stock No. 862-9249
Mfr. Part No.FXL6408UMX
Brandonsemi
kr 10,132
Each (In a Pack of 10)
Units
8 I2C 16 UMLP 400kHz Surface Mount 3.6 V 1.65 V