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. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
€1.018
Each (In a Pack of 5)
units
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS Stock No. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
€1.019
Each (In a Tube of 15)
units
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS Stock No. 510-780
Mfr. Part No.PCF8574T/3,512
BrandNXP
€1.234
Each (In a Pack of 5)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2364
Mfr. Part No.PCF8574T/3,512
BrandNXP
€1.05
Each (In a Tube of 48)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 823-3523
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
€1.069
Each (In a Pack of 10)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 922-3362
Mfr. Part No.PCF8575DW
€2.011
Each (In a Tube of 25)
units
- - - - - - - -
RS Stock No. 661-3488
Mfr. Part No.PCF8575DW
€2.368
Each (In a Pack of 5)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount - -
RS Stock No. 403-563
Mfr. Part No.MCP23008-E/P
BrandMicrochip
€0.922
Each (In a Pack of 5)
units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
€0.77
Each (In a Tube of 25)
units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS Stock No. 912-6833
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
€1.069
Each (In a Tube of 15)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 681-1143
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
€1.345
Each (In a Pack of 2)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS Stock No. 160-4440
Mfr. Part No.ADP5587ACPZ-R7
€1.258
Each (On a Reel of 1500)
units
18 I2C 24 LFCSP WQ 400kHz Surface Mount 3.6 V 1.65 V
RS Stock No. 165-4811
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
€1.343
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS Stock No. 889-5128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
€0.888
Each (In a Tube of 47)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 125-4197
Mfr. Part No.CY8C9520A-24PVXI
€4.075
Each (In a Pack of 2)
units
20 I2C 28 SSOP 100kHz Surface Mount 5.25 V 3 V
RS Stock No. 511-068
Mfr. Part No.PCA9698DGG,512
BrandNXP
€4.26
Each
units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS Stock No. 403-894
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
€1.068
Each (In a Pack of 5)
units
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS Stock No. 124-2361
Mfr. Part No.PCA9698DGG,512
BrandNXP
€3.623
Each (In a Tube of 35)
units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS Stock No. 681-1128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
€1.07
Each (In a Pack of 2)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 669-6455
Mfr. Part No.MCP23018-E/SP
BrandMicrochip
€1.276
Each (In a Pack of 5)
units
16 I2C 28 SPDIP 3.4MHz Through Hole - -
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The MCP23017/MCP23S17 (MCP23X17) device family provides 16-bit, general purpose parallel I/O expansion for I2C bus or SPI applications The two devices differ only in the serial interface.MCP23017 – I2C interface MCP23S17 – SPI interface The MCP23X17 consists of multiple 8-bit ...