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. 162-5476
Mfr. Part No.PCA9536DR
PHP57.95
Each (On a Reel of 2500)
units
- - 8 SOIC - Surface Mount - -
RS Stock No. 517-0700
Mfr. Part No.PCF8574PW
PHP66.914
Each (In a Pack of 5)
units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 145-8960
Mfr. Part No.MCP23018-E/SP
BrandMicrochip
PHP79.28
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 3.4MHz Through Hole - -
RS Stock No. 162-7823
Mfr. Part No.PCA9534PW
PHP88.494
Each (In a Tube of 90)
units
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 165-2110
Mfr. Part No.MCP23009-E/MG
BrandMicrochip
PHP48.451
Each (In a Tube of 120)
units
8 I2C 16 QFN 3.4MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 770-9723
Mfr. Part No.MCP23S08-E/ML
BrandMicrochip
PHP64.05
Each (In a Pack of 5)
units
8 Serial-SPI 20 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 809-9815
Mfr. Part No.ADP5587ACPZ-R7
PHP144.90
Each (In a Pack of 2)
units
18 I2C 24 LFCSP WQ 400kHz Surface Mount 3.6 V 1.65 V
RS Stock No. 125-4197
Mfr. Part No.CY8C9520A-24PVXI
PHP245.18
Each (In a Pack of 2)
units
20 I2C 28 SSOP 100kHz Surface Mount 5.25 V 3 V
RS Stock No. 887-7319
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
PHP58.905
Each (In a Tube of 47)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 819-5579
Mfr. Part No.MCP23S18T-E/MJ
BrandMicrochip
PHP63.53
Each (On a Reel of 3300)
units
16 Serial-SPI 24 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 727-5703
Mfr. Part No.PCA9554BS,118
BrandNXP
PHP81.90
Each (In a Pack of 2)
units
8 I2C, SMBus 16 HVQFN 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 661-3441
Mfr. Part No.PCA9535DW
PHP144.38
Each (In a Pack of 5)
units
- - 24 SOIC - Surface Mount - -
RS Stock No. 661-3371
Mfr. Part No.PCA9557PWR
PHP78.75
Each (In a Pack of 5)
units
- - 16 TSSOP - Surface Mount - -
RS Stock No. 661-3488
Mfr. Part No.PCF8575DW
PHP152.622
Each (In a Pack of 5)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount - -
RS Stock No. 177-2845
Mfr. Part No.MCP23008T-E/SO
BrandMicrochip
PHP41.078
Each (On a Reel of 1100)
units
8 I2C 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 403-894
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
PHP66.47
Each (In a Pack of 5)
units
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS Stock No. 823-3523
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
PHP66.15
Each (In a Pack of 10)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 825-3505
Mfr. Part No.TCA6408ARGTR
PHP71.40
Each (In a Pack of 5)
units
8 I2C 16 UQFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
PHP47.78
Each (In a Tube of 25)
units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
New
RS Stock No. 190-6955
Mfr. Part No.MAX7311AAG+
PHP333.855
Each (In a Pack of 2)
units
- - - - - - - -
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