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$11.865
Each (In a Tube of 15)
units
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS Stock No. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
HK$11.866
Each (In a Pack of 5)
units
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS Stock No. 165-4752
Mfr. Part No.MCP23008-E/P
BrandMicrochip
HK$8.988
Each (In a Tube of 25)
units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS Stock No. 403-563
Mfr. Part No.MCP23008-E/P
BrandMicrochip
HK$10.784
Each (In a Pack of 5)
units
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS Stock No. 510-780
Mfr. Part No.PCF8574T/3,512
BrandNXP
HK$13.756
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$9.802
Each (In a Pack of 5)
units
4 I2C, SMBus 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 517-0671
Mfr. Part No.PCF8574DW
HK$16.444
Each (In a Pack of 5)
units
- I2C 16 SOIC - Surface Mount - -
RS Stock No. 124-2364
Mfr. Part No.PCF8574T/3,512
BrandNXP
HK$11.056
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$14.018
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 166-1598
Mfr. Part No.PCA9536DP,118
BrandNXP
HK$8.19
Each (On a Reel of 2500)
units
4 I2C, SMBus 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 178-9133
Mfr. Part No.PCF8574DW
HK$13.89
Each (In a Tube of 40)
units
- I2C 16 SOIC - Surface Mount - -
New
RS Stock No. 922-3338
Mfr. Part No.PCF8574DWR
HK$6.237
Each (On a Reel of 2000)
units
- - - - - - - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
HK$25.25
Each
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 511-068
Mfr. Part No.PCA9698DGG,512
BrandNXP
HK$44.38
Each
units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2361
Mfr. Part No.PCA9698DGG,512
BrandNXP
HK$37.737
Each (In a Tube of 35)
units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS Stock No. 770-9704
Mfr. Part No.MCP23008-E/ML
BrandMicrochip
HK$10.436
Each (In a Pack of 5)
units
8 I2C 20 QFN 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 887-7432
Mfr. Part No.MCP23S08-E/SS
BrandMicrochip
HK$8.959
Each (In a Tube of 67)
units
8 SPI 20 SSOP 10MHz Surface Mount - -
RS Stock No. 177-2850
Mfr. Part No.MCP23S08T-E/SS
BrandMicrochip
HK$8.18
Each (On a Reel of 1600)
units
8 SPI 20 SSOP 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 823-4226
Mfr. Part No.PCA9535ECDWR2G
HK$20.486
Each (In a Pack of 10)
units
16 I2C 24 SOIC 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 190-6900
Mfr. Part No.MAX7301ATL+T
HK$56.765
Each (In a Pack of 2)
units
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