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 11,239
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 11,246
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
kr 10,747
Each (In a Tube of 15)
Units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 403-636
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
kr 10,25
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 8,688
Each (In a Pack of 5)
Units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
kr 10,748
Each (In a Pack of 5)
Units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 144-5721
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
kr 8,502
Each (In a Tube of 25)
Units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
kr 8,144
Each (In a Tube of 25)
Units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
kr 12,06
Each
Units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 403-812
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
kr 10,25
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
kr 8,501
Each (In a Tube of 42)
Units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 920-3374
Mfr. Part No.PCF8574AN
kr 10,792
Each (In a Tube of 25)
Units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 517-0261
Mfr. Part No.PCF8574APW
kr 13,66
Each
Units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 661-3475
Mfr. Part No.PCF8575CDW
kr 35,434
Each (In a Pack of 5)
Units
- - 24 SOIC - Surface Mount - -
RS Stock No. 483-7109
Mfr. Part No.PCA9535D,112
BrandNXP
kr 15,632
Each (In a Pack of 5)
Units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount - -
RS Stock No. 661-3488
Mfr. Part No.PCF8575DW
kr 28,036
Each (In a Pack of 5)
Units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount - -
RS Stock No. 145-6521
Mfr. Part No.PCF8574APW
kr 11,50
Each (In a Tube of 70)
Units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 510-780
Mfr. Part No.PCF8574T/3,512
BrandNXP
kr 12,562
Each (In a Pack of 5)
Units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 190-6927
Mfr. Part No.MAX7310AUE+
kr 32,522
Each (In a Pack of 5)
Units
- - - - - - - -
RS Stock No. 146-0195
Mfr. Part No.MCP23018-E/SS
BrandMicrochip
kr 12,375
Each (In a Tube of 59)
Units
16 I2C 24 SSOP 3.4MHz Surface Mount 5.5 V 1.8 V
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