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. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
TWD35
Each (In a Tube of 15)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
TWD46
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 103-8071
Mfr. Part No.PCF8574AT/3,512
BrandNXP
TWD25
Each (In a Tube of 48)
units
8 I2C 16 SOIC 100kHz Surface Mount - -
RS Stock No. 727-5642
Mfr. Part No.PCF8574AT/3,512
BrandNXP
TWD52
Each (In a Pack of 2)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 819-5575
Mfr. Part No.MCP23S17T-E/SS
BrandMicrochip
TWD35
Each (On a Reel of 2100)
units
16 Serial-SPI 28 SSOP 10MHz Surface Mount 5.5 V 4.5 V
RS Stock No. 403-816
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
TWD56
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 403-894
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
TWD48
Each (In a Pack of 5)
units
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS Stock No. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
TWD28
Each (In a Tube of 27)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 669-6452
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
TWD45
Each (In a Pack of 5)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 887-7381
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
TWD30
Each (In a Tube of 27)
units
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS Stock No. 887-7319
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
TWD32
Each (In a Tube of 47)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 162-7823
Mfr. Part No.PCA9534PW
TWD50
Each (In a Tube of 90)
units
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 889-5128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
TWD30
Each (In a Tube of 47)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 146-1223
Mfr. Part No.MAX7301AAX+
BrandMaxim
TWD240
Each (In a Tube of 30)
units
- - 36 SSOP - Surface Mount - -
RS Stock No. 812-2666
Mfr. Part No.PCA9534PW
TWD55
Each
units
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2365
Mfr. Part No.PCF8574TS/3,112
BrandNXP
TWD30
Each (In a Tube of 75)
units
8 I2C 20 SSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 622-9500
Mfr. Part No.MAX7301AAX+
BrandMaxim
TWD238
Each
units
- - 36 SSOP - Surface Mount - -
RS Stock No. 166-0161
Mfr. Part No.PCA9555D,118
BrandNXP
TWD51
Each (On a Reel of 1000)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 823-3523
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
TWD44
Each (In a Pack of 10)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 510-784
Mfr. Part No.PCF8574TS/3,112
BrandNXP
TWD32
Each
units
8 - 20 SSOP 100kHz Surface Mount 6 V 2.5 V