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 10,601
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 10,598
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 8,024
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 10,109
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 9,132
Each (In a Pack of 5)
Units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 403-636
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
kr 9,572
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 10,11
Each (In a Pack of 5)
Units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
kr 7,725
Each (In a Tube of 25)
Units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
kr 12,06
Each
Units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 920-3374
Mfr. Part No.PCF8574AN
kr 10,261
Each (In a Tube of 25)
Units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 403-812
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
kr 9,572
Each (In a Pack of 5)
Units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 889-5285
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
kr 8,024
Each (In a Tube of 42)
Units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 483-7171
Mfr. Part No.PCA9554D,112
BrandNXP
kr 13,24
Each (In a Pack of 5)
Units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 168-5035
Mfr. Part No.TCA9554DBQR
kr 4,986
Each (On a Reel of 2500)
Units
8 I2C, Parallel 16 SSOP 100 (Standard) kHz, 400 (Fast) kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 145-9007
Mfr. Part No.MCP23016-I/SS
BrandMicrochip
kr 11,981
Each (In a Tube of 47)
Units
16 I2C 28 SSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 687-8770
Mfr. Part No.MCP23S08-E/SS
BrandMicrochip
kr 9,67
Each
Units
8 SPI 20 SSOP 10MHz Surface Mount - -
RS Stock No. 190-6927
Mfr. Part No.MAX7310AUE+
kr 29,99
Each (In a Pack of 5)
Units
- Serial-I2C (2-Wire) - TSSOP - Surface Mount 5.5 V 2.3 V
RS Stock No. 177-3255
Mfr. Part No.MCP23017T-E/SO
BrandMicrochip
kr 10,10
Each (In a Pack of 10)
Units
16 I2C 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 103-8074
Mfr. Part No.PCA9518PW,112
BrandNXP
kr 15,637
Each (In a Tube of 75)
Units
- - - TSSOP - Surface Mount - -
RS Stock No. 483-7187
Mfr. Part No.PCA9554PW,112
BrandNXP
kr 13,06
Each (In a Pack of 5)
Units
- - 16 TSSOP - Surface Mount - -
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