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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Omschrijving Prijs Number of I/O Channels Interface Number of Pins Package Type Clock Frequency Mounting Type Maximum Supply Voltage Minimum Supply Voltage
RS-stocknr. 144-5723
FabrikantnummerMCP23017-E/SP
FabrikantMicrochip
€ 0,917
Each (In a Tube of 15)
Aantal stuks
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS-stocknr. 403-806
FabrikantnummerMCP23017-E/SP
FabrikantMicrochip
€ 1,058
Each (In a Pack of 5)
Aantal stuks
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS-stocknr. 889-5109
FabrikantnummerMCP23017-E/SO
FabrikantMicrochip
€ 0,87
Each (In a Tube of 27)
Aantal stuks
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS-stocknr. 403-816
FabrikantnummerMCP23017-E/SO
FabrikantMicrochip
€ 1,058
Each (In a Pack of 5)
Aantal stuks
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS-stocknr. 770-9707
FabrikantnummerMCP23008-E/SS
FabrikantMicrochip
€ 0,978
Each (In a Pack of 5)
Aantal stuks
8 I2C 20 SSOP 1.7MHz Surface Mount 5.5 V 1.8 V
RS-stocknr. 403-894
FabrikantnummerMCP23S17-E/SO
FabrikantMicrochip
€ 1,116
Each (In a Pack of 5)
Aantal stuks
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS-stocknr. 165-2044
FabrikantnummerMCP23008-E/SS
FabrikantMicrochip
€ 0,802
Each (In a Tube of 67)
Aantal stuks
8 I2C 20 SSOP 1.7MHz Surface Mount 5.5 V 1.8 V
RS-stocknr. 889-5323
FabrikantnummerMCP23008-E/SO
FabrikantMicrochip
€ 0,735
Each (In a Tube of 42)
Aantal stuks
8 I2C, Serial MHz 18 SOIC 5MHz Surface Mount - -
RS-stocknr. 681-1128
FabrikantnummerMCP23017-E/SS
FabrikantMicrochip
€ 1,12
Each (In a Pack of 2)
Aantal stuks
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS-stocknr. 403-642
FabrikantnummerMCP23008-E/SO
FabrikantMicrochip
€ 0,898
Each (In a Pack of 5)
Aantal stuks
8 I2C, Serial MHz 18 SOIC 5MHz Surface Mount - -
RS-stocknr. 887-7381
FabrikantnummerMCP23S17-E/SO
FabrikantMicrochip
€ 0,915
Each (In a Tube of 27)
Aantal stuks
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS-stocknr. 889-5128
FabrikantnummerMCP23017-E/SS
FabrikantMicrochip
€ 0,915
Each (In a Tube of 47)
Aantal stuks
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS-stocknr. 912-6833
FabrikantnummerMCP23S17-E/SP
FabrikantMicrochip
€ 0,965
Each (In a Tube of 15)
Aantal stuks
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS-stocknr. 823-3523
FabrikantnummerMCP23S17-E/SP
FabrikantMicrochip
€ 0,965
Each (In a Pack of 10)
Aantal stuks
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS-stocknr. 165-2077
FabrikantnummerMCP23008-E/ML
FabrikantMicrochip
€ 0,802
Each (In a Tube of 91)
Aantal stuks
8 I2C 20 QFN 1.7MHz Surface Mount 5.5 V 1.8 V
RS-stocknr. 165-4811
FabrikantnummerMCP23016-I/SP
FabrikantMicrochip
€ 1,215
Each (In a Tube of 15)
Aantal stuks
16 I2C 28 SPDIP 400MHz Through Hole - -
RS-stocknr. 770-9704
FabrikantnummerMCP23008-E/ML
FabrikantMicrochip
€ 0,978
Each (In a Pack of 5)
Aantal stuks
8 I2C 20 QFN 1.7MHz Surface Mount 5.5 V 1.8 V
RS-stocknr. 681-1143
FabrikantnummerMCP23016-I/SP
FabrikantMicrochip
€ 1,40
Each (In a Pack of 2)
Aantal stuks
16 I2C 28 SPDIP 400MHz Through Hole - -
RS-stocknr. 159-7514
FabrikantnummerMTCH652-I/SS
FabrikantMicrochip
€ 1,209
Each (In a Tube of 47)
Aantal stuks
19 Serial-SPI 28 SSOP 2MHz Surface Mount 5.5 V 1.8 V
RS-stocknr. 403-812
FabrikantnummerMCP23S08-E/SO
FabrikantMicrochip
€ 0,942
Each (In a Pack of 5)
Aantal stuks
8 SPI 18 SOIC 10MHz Surface Mount - -