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 9,618
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 9,621
Each (In a Pack of 10)
Units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 144-5721
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
kr 5,856
Each (In a Tube of 25)
Units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
kr 9,146
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
kr 9,372
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
kr 7,438
Each (In a Tube of 25)
Units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 403-636
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
kr 5,988
Each (In a Pack of 5)
Units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
kr 10,986
Each (In a Pack of 5)
Units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 889-5285
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
kr 7,881
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 9,83
Each (In a Pack of 5)
Units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 770-9713
Mfr. Part No.MCP23016-I/ML
BrandMicrochip
kr 8,963
Each (In a Pack of 3)
Units
16 I2C 28 QFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 912-6791
Mfr. Part No.MCP23S09-E/MG
BrandMicrochip
kr 8,439
Each (In a Tube of 120)
Units
8 Serial-SPI 16 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 770-9717
Mfr. Part No.MCP23016-I/SS
BrandMicrochip
kr 15,487
Each (In a Pack of 3)
Units
16 I2C 28 SSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 669-6458
Mfr. Part No.MCP23016-I/SO
BrandMicrochip
kr 14,456
Each (In a Pack of 5)
Units
16 I2C 28 SOIC 1MHz Surface Mount - -
RS Stock No. 770-9732
Mfr. Part No.MCP23S09-E/MG
BrandMicrochip
kr 11,684
Each (In a Pack of 5)
Units
8 Serial-SPI 16 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 145-9006
Mfr. Part No.MCP23016-I/ML
BrandMicrochip
kr 9,135
Each (In a Tube of 61)
Units
16 I2C 28 QFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 165-2077
Mfr. Part No.MCP23008-E/ML
BrandMicrochip
kr 8,102
Each (In a Tube of 91)
Units
8 I2C 20 QFN 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 911-5631
Mfr. Part No.MCP23017-E/ML
BrandMicrochip
kr 10,433
Each (In a Tube of 61)
Units
16 I2C 28 QFN 1.7MHz Surface Mount - -
RS Stock No. 177-3187
Mfr. Part No.MCP23008T-E/SO
BrandMicrochip
kr 7,777
Each (In a Pack of 10)
Units
8 I2C 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 145-9007
Mfr. Part No.MCP23016-I/SS
BrandMicrochip
kr 12,433
Each (In a Tube of 47)
Units
16 I2C 28 SSOP 400kHz Surface Mount 5.5 V 2 V