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. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
HK$10.578
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
HK$10.27
Each (In a Tube of 15)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
HK$7.79
Each (In a Tube of 25)
units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 403-563
Mfr. Part No.MCP23008-E/P
BrandMicrochip
HK$9.61
Each (In a Pack of 5)
units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 177-3101
Mfr. Part No.MCP23S17T-E/SO
BrandMicrochip
HK$10.94
Each (In a Pack of 10)
units
16 SPI 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 165-2077
Mfr. Part No.MCP23008-E/ML
BrandMicrochip
HK$8.077
Each (In a Tube of 91)
units
8 I2C 20 QFN 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 770-9723
Mfr. Part No.MCP23S08-E/ML
BrandMicrochip
HK$10.44
Each (In a Pack of 5)
units
8 Serial-SPI 20 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 403-816
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
HK$10.32
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 887-7432
Mfr. Part No.MCP23S08-E/SS
BrandMicrochip
HK$8.21
Each (In a Tube of 67)
units
8 SPI 20 SSOP 10MHz Surface Mount - -
RS Stock No. 681-1128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
HK$10.855
Each (In a Pack of 2)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 770-9735
Mfr. Part No.MCP23S17-E/ML
BrandMicrochip
HK$12.92
Each (In a Pack of 3)
units
16 Serial-SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 889-5323
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
HK$7.27
Each (In a Tube of 42)
units
8 I2C, Serial MHz 18 SOIC 5MHz Surface Mount - -
RS Stock No. 146-0195
Mfr. Part No.MCP23018-E/SS
BrandMicrochip
HK$11.81
Each (In a Tube of 59)
units
16 I2C 24 SSOP 3.4MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 165-2044
Mfr. Part No.MCP23008-E/SS
BrandMicrochip
HK$8.077
Each (In a Tube of 67)
units
8 I2C 20 SSOP 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 159-7569
Mfr. Part No.MTCH652-I/MV
BrandMicrochip
HK$12.49
Each (In a Tube of 91)
units
19 Serial-3 Wire, Serial-SPI 28 UQFN 2MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 669-6461
Mfr. Part No.MCP23S18-E/SO
BrandMicrochip
HK$14.10
Each (In a Pack of 2)
units
16 SPI 28 SOIC 10MHz Surface Mount - -
RS Stock No. 911-5631
Mfr. Part No.MCP23017-E/ML
BrandMicrochip
HK$10.10
Each (In a Tube of 61)
units
16 I2C 28 QFN 1.7MHz Surface Mount - -
RS Stock No. 177-2851
Mfr. Part No.MCP23S17T-E/ML
BrandMicrochip
HK$9.88
Each (On a Reel of 1600)
units
16 SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 165-2079
Mfr. Part No.MCP23S08-E/ML
BrandMicrochip
HK$8.73
Each (In a Tube of 91)
units
8 Serial-SPI 20 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 165-2110
Mfr. Part No.MCP23009-E/MG
BrandMicrochip
HK$7.97
Each (In a Tube of 120)
units
8 I2C 16 QFN 3.4MHz Surface Mount 5.5 V 1.8 V