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. 145-0789
Mfr. Part No.PCA9557D
PHP76.146
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 177-2847
Mfr. Part No.MCP23017T-E/SO
BrandMicrochip
PHP47.924
Each (On a Reel of 1600)
units
16 I2C 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 661-3441
Mfr. Part No.PCA9535DW
PHP141.492
Each (In a Pack of 5)
units
- - 24 SOIC - Surface Mount - -
RS Stock No. 165-2102
Mfr. Part No.MCP23S17-E/ML
BrandMicrochip
PHP66.367
Each (In a Tube of 61)
units
16 Serial-SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 912-6791
Mfr. Part No.MCP23S09-E/MG
BrandMicrochip
PHP49.392
Each (In a Tube of 120)
units
8 Serial-SPI 16 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 809-9812
Mfr. Part No.ADP5588ACPZ-R7
PHP139.76
Each (In a Pack of 2)
units
18 I2C 24 LFCSP WQ 400kHz Surface Mount 3 V 1.7 V
RS Stock No. 799-3160
Mfr. Part No.MAX7312AAG+
PHP243.08
Each (In a Pack of 2)
units
16 Serial-2 Wire 24 SSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 162-8708
Mfr. Part No.TCA6416ARTWR
PHP70.191
Each (On a Reel of 3000)
units
16 I2C, Serial 24 WQFN 400kHz Surface Mount 5.5 V 1.65 V
New
RS Stock No. 190-0596
Mfr. Part No.MAX7318ATG+
PHP236.00
Each (In a Pack of 2)
units
16 Serial-2 Wire 24 QFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 889-5323
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
PHP43.737
Each (In a Tube of 42)
units
8 I2C, Serial MHz 18 SOIC 5MHz Surface Mount - -
RS Stock No. 168-5033
Mfr. Part No.TCA9538DBR
PHP40.244
Each (On a Reel of 2000)
units
8 I2C, Parallel 16 SSOP 100 (Standard) kHz, 400 (Fast) kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 124-9971
Mfr. Part No.CAT9554YI-GT2
PHP35.858
Each (On a Reel of 2000)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 177-2850
Mfr. Part No.MCP23S08T-E/SS
BrandMicrochip
PHP45.818
Each (On a Reel of 1600)
units
8 SPI 20 SSOP 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-2851
Mfr. Part No.MCP23S17T-E/ML
BrandMicrochip
PHP60.037
Each (On a Reel of 1600)
units
16 SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 661-3479
Mfr. Part No.PCF8575CPW
PHP166.188
Each (In a Pack of 5)
units
- - 24 TSSOP - Surface Mount - -
RS Stock No. 162-8706
Mfr. Part No.TCA6408ARGTR
PHP61.206
Each (On a Reel of 3000)
units
8 I2C 16 UQFN 400kHz Surface Mount 5.5 V 1.65 V
New
RS Stock No. 190-6927
Mfr. Part No.MAX7310AUE+
PHP223.164
Each (In a Pack of 5)
units
- - - - - - - -
RS Stock No. 727-5670
Mfr. Part No.PCA9518PW,112
BrandNXP
PHP107.945
Each (In a Pack of 2)
units
- - - TSSOP - Surface Mount - -
RS Stock No. 124-2365
Mfr. Part No.PCF8574TS/3,112
BrandNXP
PHP72.389
Each (In a Tube of 75)
units
8 I2C 20 SSOP 100kHz Surface Mount 6 V 2.5 V
New
RS Stock No. 189-7051
Mfr. Part No.MAX7301AAX+
PHP324.167
Each (In a Tube of 30)
units
- - 36 SSOP - Surface Mount - -
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