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. 823-3523
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
$2.547
Each (In a Pack of 10)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 912-6833
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
$2.222
Each (In a Tube of 15)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
$2.122
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
$2.121
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
$1.608
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
$1.92
Each (In a Pack of 5)
units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
$1.764
Each (In a Tube of 27)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 403-816
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
$2.122
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 681-1143
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
$2.61
Each (In a Pack of 2)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS Stock No. 165-4811
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
$2.662
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS Stock No. 124-2337
Mfr. Part No.P82B715TD,112
BrandNXP
$3.98
Each (In a Tube of 100)
units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - -
RS Stock No. 889-5285
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
$1.595
Each (In a Tube of 42)
units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 681-1128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
$1.855
Each (In a Pack of 2)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 403-812
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
$2.01
Each (In a Pack of 5)
units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 770-9723
Mfr. Part No.MCP23S08-E/ML
BrandMicrochip
$2.058
Each (In a Pack of 5)
units
8 Serial-SPI 20 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 166-1598
Mfr. Part No.PCA9536DP,118
BrandNXP
$0.957
Each (On a Reel of 2500)
units
4 I2C, SMBus 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 165-2079
Mfr. Part No.MCP23S08-E/ML
BrandMicrochip
$1.716
Each (In a Tube of 91)
units
8 Serial-SPI 20 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 887-7432
Mfr. Part No.MCP23S08-E/SS
BrandMicrochip
$1.617
Each (In a Tube of 67)
units
8 SPI 20 SSOP 10MHz Surface Mount - -
RS Stock No. 273-539
Mfr. Part No.P82B715TD,112
BrandNXP
$5.10
Each
units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - -
RS Stock No. 889-5128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
$1.853
Each (In a Tube of 47)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
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