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
$1.729
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
$1.944
Each (In a Pack of 10)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
$1.98
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
$1.905
Each (In a Tube of 15)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 403-563
Mfr. Part No.MCP23008-E/P
BrandMicrochip
$1.694
Each (In a Pack of 5)
units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
$1.408
Each (In a Tube of 25)
units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 517-0687
Mfr. Part No.PCF8574N
$2.20
Each (In a Pack of 5)
units
8 I2C, SMBus 16 PDIP - Through Hole - -
RS Stock No. 920-3393
Mfr. Part No.PCF8574N
$2.029
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP - Through Hole - -
RS Stock No. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
$1.661
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
$1.98
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 681-1143
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
$2.605
Each (In a Pack of 2)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS Stock No. 165-4811
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
$2.68
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS Stock No. 687-8770
Mfr. Part No.MCP23S08-E/SS
BrandMicrochip
$1.86
Each
units
8 SPI 20 SSOP 10MHz Surface Mount - -
RS Stock No. 770-9723
Mfr. Part No.MCP23S08-E/ML
BrandMicrochip
$1.71
Each (In a Pack of 5)
units
8 Serial-SPI 20 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 124-2337
Mfr. Part No.P82B715TD,112
BrandNXP
$4.114
Each (In a Tube of 100)
units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - -
RS Stock No. 166-1598
Mfr. Part No.PCA9536DP,118
BrandNXP
$0.967
Each (On a Reel of 2500)
units
4 I2C, SMBus 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 889-5128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
$1.589
Each (In a Tube of 47)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 887-7432
Mfr. Part No.MCP23S08-E/SS
BrandMicrochip
$1.451
Each (In a Tube of 67)
units
8 SPI 20 SSOP 10MHz Surface Mount - -
RS Stock No. 510-914
Mfr. Part No.PCA9536DP,118
BrandNXP
$1.564
Each (In a Pack of 5)
units
4 - 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 889-5285
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
$1.474
Each (In a Tube of 42)
units
8 SPI 18 SOIC 10MHz Surface Mount - -
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