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. 124-2366
Mfr. Part No.PCF8575TS/1,112
BrandNXP
HK$15.57
Each (In a Tube of 59)
units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 103-8074
Mfr. Part No.PCA9518PW,112
BrandNXP
HK$15.914
Each (In a Tube of 75)
units
- - - TSSOP - Surface Mount - -
RS Stock No. 403-816
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
HK$10.32
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 889-5323
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
HK$7.27
Each (In a Tube of 42)
units
8 I2C, Serial MHz 18 SOIC 5MHz Surface Mount - -
RS Stock No. 160-3384
Mfr. Part No.ADP5588ACPZ-R7
HK$14.421
Each (On a Reel of 1500)
units
18 I2C 24 LFCSP WQ 400kHz Surface Mount 3 V 1.7 V
RS Stock No. 732-1183
Mfr. Part No.PCF8574RGYR
HK$12.77
Each (In a Pack of 5)
units
8 I2C 20 VQFN 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 145-0789
Mfr. Part No.PCA9557D
HK$12.66
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 177-3101
Mfr. Part No.MCP23S17T-E/SO
BrandMicrochip
HK$10.94
Each (In a Pack of 10)
units
16 SPI 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 125-4198
Mfr. Part No.CY8C9540A-24PVXI
HK$69.65
Each
units
40 I2C 48 SSOP 100kHz Surface Mount 5.25 V 3 V
RS Stock No. 124-2365
Mfr. Part No.PCF8574TS/3,112
BrandNXP
HK$12.26
Each (In a Tube of 75)
units
8 I2C 20 SSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 510-841
Mfr. Part No.PCA9539PW,112
BrandNXP
HK$20.10
Each (In a Pack of 5)
units
- - 24 TSSOP - Surface Mount - -