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. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
HK$10.27
Each (In a Tube of 15)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
HK$10.578
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
HK$7.79
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
HK$9.61
Each (In a Pack of 5)
units
8 I2C, Serial MHz 18 PDIP 5MHz Through Hole - -
RS Stock No. 517-0671
Mfr. Part No.PCF8574DW
HK$12.05
Each (In a Pack of 5)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 166-1598
Mfr. Part No.PCA9536DP,118
BrandNXP
HK$3.893
Each (On a Reel of 2500)
units
4 I2C, SMBus 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2364
Mfr. Part No.PCF8574T/3,512
BrandNXP
HK$10.53
Each (In a Tube of 48)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 920-3374
Mfr. Part No.PCF8574AN
HK$10.18
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 661-3387
Mfr. Part No.PCF8574DWR
HK$12.84
Each (In a Pack of 5)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 510-780
Mfr. Part No.PCF8574T/3,512
BrandNXP
HK$12.69
Each (In a Pack of 5)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 510-914
Mfr. Part No.PCA9536DP,118
BrandNXP
HK$9.61
Each (In a Pack of 5)
units
4 - 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 178-9133
Mfr. Part No.PCF8574DW
HK$13.134
Each (In a Tube of 40)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
HK$12.25
Each
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 124-2361
Mfr. Part No.PCA9698DGG,512
BrandNXP
HK$35.85
Each (In a Tube of 35)
units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS Stock No. 511-068
Mfr. Part No.PCA9698DGG,512
BrandNXP
HK$42.19
Each
units
40 - 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS Stock No. 823-4236
Mfr. Part No.PCA9535EMTTXG
HK$14.97
Each (In a Pack of 10)
units
16 I2C 24 QFN 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 166-0161
Mfr. Part No.PCA9555D,118
BrandNXP
HK$12.697
Each (On a Reel of 1000)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 165-2102
Mfr. Part No.MCP23S17-E/ML
BrandMicrochip
HK$11.04
Each (In a Tube of 61)
units
16 Serial-SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 687-8480
Mfr. Part No.MCP23S09-E/SO
BrandMicrochip
HK$10.22
Each
units
8 SPI 18 SOIC 10MHz Surface Mount - -
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
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