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. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
$2.069
Each (In a Tube of 15)
units
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
$2.558
Each (In a Pack of 5)
units
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS Stock No. 124-2364
Mfr. Part No.PCF8574T/3,512
BrandNXP
$2.262
Each (In a Tube of 48)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 510-780
Mfr. Part No.PCF8574T/3,512
BrandNXP
$3.096
Each (In a Pack of 5)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
$1.759
Each (In a Tube of 27)
units
16 I2C, Serial 28 SOIC 5MHz Surface Mount - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
$3.22
Each
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 403-816
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
$2.83
Each (In a Pack of 5)
units
16 I2C, Serial 28 SOIC 5MHz Surface Mount - -
RS Stock No. 920-3374
Mfr. Part No.PCF8574AN
$2.552
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 889-5128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
$1.826
Each (In a Tube of 47)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 124-2365
Mfr. Part No.PCF8574TS/3,112
BrandNXP
$2.05
Each (In a Tube of 75)
units
8 I2C 20 SSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 510-784
Mfr. Part No.PCF8574TS/3,112
BrandNXP
$3.08
Each
units
8 I2C 20 SSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 681-1128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
$1.945
Each (In a Pack of 2)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
$1.658
Each (In a Tube of 25)
units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS Stock No. 403-563
Mfr. Part No.MCP23008-E/P
BrandMicrochip
$2.088
Each (In a Pack of 5)
units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS Stock No. 124-2355
Mfr. Part No.PCA9555D,112
BrandNXP
$2.772
Each (In a Tube of 30)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 103-5691
Mfr. Part No.PCA9554D,112
BrandNXP
$1.726
Each (In a Tube of 48)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount - -
RS Stock No. 483-7193
Mfr. Part No.PCA9555D,112
BrandNXP
$3.19
Each
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 403-636
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
$2.418
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
$1.506
Each (In a Tube of 25)
units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 145-8960
Mfr. Part No.MCP23018-E/SP
BrandMicrochip
$2.371
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 3.4MHz Through Hole - -