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. 144-5721
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
MYR4.039
Each (In a Tube of 25)
units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 403-636
Mfr. Part No.MCP23S08-E/P
BrandMicrochip
MYR4.214
Each (In a Pack of 5)
units
8 SPI 18 PDIP 10MHz Through Hole - -
RS Stock No. 165-2044
Mfr. Part No.MCP23008-E/SS
BrandMicrochip
MYR3.648
Each (In a Tube of 67)
units
8 I2C 20 SSOP 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 770-9707
Mfr. Part No.MCP23008-E/SS
BrandMicrochip
MYR4.498
Each (In a Pack of 5)
units
8 I2C 20 SSOP 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 166-0161
Mfr. Part No.PCA9555D,118
BrandNXP
MYR7.368
Each (On a Reel of 1000)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 669-6452
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
MYR4.87
Each (In a Pack of 5)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 887-7319
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
MYR4.047
Each (In a Tube of 47)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 124-2337
Mfr. Part No.P82B715TD,112
BrandNXP
MYR9.548
Each (In a Tube of 100)
units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - -
RS Stock No. 727-5624
Mfr. Part No.PCA9505DGG,112
BrandNXP
MYR16.21
Each
units
- - - TSSOP 100 kHz, 400 kHz Surface Mount 5 V 2.3 V
RS Stock No. 273-539
Mfr. Part No.P82B715TD,112
BrandNXP
MYR14.10
Each
units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - -
RS Stock No. 797-4728
Mfr. Part No.PCA9555D,118
BrandNXP
MYR8.105
Each (In a Pack of 2)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 819-5575
Mfr. Part No.MCP23S17T-E/SS
BrandMicrochip
MYR3.962
Each (On a Reel of 2100)
units
16 Serial-SPI 28 SSOP 10MHz Surface Mount 5.5 V 4.5 V
RS Stock No. 145-0789
Mfr. Part No.PCA9557D
MYR6.05
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 796-8495
Mfr. Part No.XIO2001IZGU
MYR26.22
Each
units
16 Serial-2 Wire 169 BGA 66MHz Surface Mount 3.6 V 3 V
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
MYR7.936
Each (In a Pack of 5)
units
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS Stock No. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
MYR4.087
Each (In a Tube of 27)
units
16 I2C, Serial 28 SOIC 5MHz Surface Mount - -
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
MYR3.866
Each (In a Tube of 25)
units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS Stock No. 124-2364
Mfr. Part No.PCF8574T/3,512
BrandNXP
MYR4.988
Each (In a Tube of 48)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 912-6833
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
MYR5.145
Each (In a Tube of 15)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 403-563
Mfr. Part No.MCP23008-E/P
BrandMicrochip
MYR4.46
Each (In a Pack of 5)
units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
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