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. 177-3316
Mfr. Part No.MCP23017T-E/SS
HK$10.94
Each (In a Pack of 10)
units
16 I2C 28 SSOP 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-3220
Mfr. Part No.MCP23017T-E/ML
HK$12.36
Each (In a Pack of 5)
units
16 I2C 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-2848
Mfr. Part No.MCP23017T-E/SS
HK$8.23
Each (On a Reel of 2100)
units
16 I2C 28 SSOP 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-3082
Mfr. Part No.MCP23S17T-E/ML
HK$13.12
Each (In a Pack of 5)
units
16 SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-3187
Mfr. Part No.MCP23008T-E/SO
HK$8.84
Each (In a Pack of 10)
units
8 I2C 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-3101
Mfr. Part No.MCP23S17T-E/SO
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. 177-3255
Mfr. Part No.MCP23017T-E/SO
HK$10.43
Each (In a Pack of 10)
units
16 I2C 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-2851
Mfr. Part No.MCP23S17T-E/ML
HK$9.88
Each (On a Reel of 1600)
units
16 SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-2846
Mfr. Part No.MCP23017T-E/ML
HK$9.394
Each (On a Reel of 1600)
units
16 I2C 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-3338
Mfr. Part No.MCP23S08T-E/SO
HK$9.26
Each (In a Pack of 10)
units
8 SPI 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-2850
Mfr. Part No.MCP23S08T-E/SS
HK$7.54
Each (On a Reel of 1600)
units
8 SPI 20 SSOP 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-2847
Mfr. Part No.MCP23017T-E/SO
HK$7.89
Each (On a Reel of 1600)
units
16 I2C 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-2849
Mfr. Part No.MCP23S08T-E/SO
HK$7.02
Each (On a Reel of 1100)
units
8 SPI 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-3372
Mfr. Part No.MCP23S08T-E/SS
HK$9.93
Each (In a Pack of 10)
units
8 SPI 20 SSOP 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-2852
Mfr. Part No.MCP23S17T-E/SO
HK$8.23
Each (On a Reel of 1600)
units
16 SPI 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-2845
Mfr. Part No.MCP23008T-E/SO
HK$6.76
Each (On a Reel of 1100)
units
8 I2C 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V