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
SGD1.281
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
SGD1.815
Each (In a Pack of 10)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
SGD1.435
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
SGD1.85
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 103-5691
Mfr. Part No.PCA9554D,112
BrandNXP
SGD1.461
Each (In a Tube of 48)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount - -
RS Stock No. 483-7171
Mfr. Part No.PCA9554D,112
BrandNXP
SGD1.802
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 920-3374
Mfr. Part No.PCF8574AN
SGD1.48
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
SGD1.78
Each
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
SGD1.178
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
SGD1.842
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 124-2364
Mfr. Part No.PCF8574T/3,512
BrandNXP
SGD1.399
Each (In a Tube of 48)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 403-636
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
SGD1.646
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
SGD1.298
Each (In a Tube of 25)
units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 510-780
Mfr. Part No.PCF8574T/3,512
BrandNXP
SGD1.744
Each (In a Pack of 5)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 517-0687
Mfr. Part No.PCF8574N
SGD2.262
Each (In a Pack of 5)
units
8 I2C, SMBus 16 PDIP - Through Hole - -
RS Stock No. 825-3508
Mfr. Part No.TCA6408ARSVR
SGD1.372
Each (In a Pack of 5)
units
8 I2C 16 QFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 124-2366
Mfr. Part No.PCF8575TS/1,112
BrandNXP
SGD1.929
Each (In a Tube of 59)
units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 920-3393
Mfr. Part No.PCF8574N
SGD1.831
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP - Through Hole - -
RS Stock No. 162-8707
Mfr. Part No.TCA6408ARSVR
SGD0.789
Each (On a Reel of 3000)
units
8 I2C 16 QFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 436-8344
Mfr. Part No.PCF8575TS/1,112
BrandNXP
SGD2.80
Each
units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V
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