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. 168-5139
Mfr. Part No.PCF8574PW
HK$14.102
Each (In a Tube of 70)
units
- I2C 20 TSSOP - Surface Mount - -
RS Stock No. 190-0469
Mfr. Part No.MAX7312ATG+
HK$40.615
Each (In a Pack of 2)
units
16 Serial-2 Wire 24 TQFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 190-6106
Mfr. Part No.MAX7300AAX+
HK$70.172
Each (In a Tube of 30)
units
28 Serial I2C 36 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 887-7426
Mfr. Part No.MCP23016-I/SO
BrandMicrochip
HK$13.385
Each (In a Tube of 27)
units
16 I2C 28 SOIC 1MHz Surface Mount - -
RS Stock No. 133-0708
Mfr. Part No.TCA9554DBQR
HK$13.114
Each (In a Pack of 5)
units
8 I2C, Parallel 16 SSOP 100 (Standard) kHz, 400 (Fast) kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 661-3371
Mfr. Part No.PCA9557PWR
HK$12.58
Each (In a Pack of 5)
units
- - 16 TSSOP - Surface Mount - -
RS Stock No. 190-6112
Mfr. Part No.MAX7311AUG+
HK$52.62
Each (In a Tube of 62)
units
16 Serial I2C 24 TSSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 124-1424
Mfr. Part No.FXL6408UMX
HK$4.83
Each (On a Reel of 5000)
units
8 I2C 16 UMLP 400kHz Surface Mount 3.6 V 1.65 V
RS Stock No. 190-7042
Mfr. Part No.MAX7300AAI+
HK$50.315
Each (In a Pack of 2)
units
- Serial I2C - SSOP - Surface Mount 5.5 V 2.5 V
RS Stock No. 799-3160
Mfr. Part No.MAX7312AAG+
HK$39.45
Each (In a Pack of 2)
units
16 Serial-2 Wire 24 SSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 189-7059
Mfr. Part No.MAX7318ATG+
HK$34.872
Each (In a Tube of 75)
units
16 Serial-2 Wire 24 QFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 190-7001
Mfr. Part No.MAX7311AUG+
HK$61.08
Each (In a Pack of 2)
units
- Serial I2C - TSSOP - Surface Mount 5.5 V 2 V
RS Stock No. 889-5323
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
HK$8.611
Each (In a Tube of 42)
units
8 I2C, Serial 18 SOIC 5MHz Surface Mount - -
RS Stock No. 191-3995
Mfr. Part No.MAX7315AUE+
HK$26.82
Each (In a Tube of 96)
units
8 Serial-2 Wire 16 TSSOP 400kHz Surface Mount 3.6 V 2 V
RS Stock No. 922-3356
Mfr. Part No.PCF8575CDW
HK$25.158
Each (In a Tube of 25)
units
- - - - - - - -
RS Stock No. 190-6108
Mfr. Part No.MAX7301ATL+T
HK$40.068
Each (On a Reel of 2500)
units
28 Serial I2C 40 TQFN - Surface Mount 5.5 V 2.5 V
RS Stock No. 159-6630
Mfr. Part No.MCP23018-E/SO
BrandMicrochip
HK$11.739
Each (In a Tube of 27)
units
16 I2C 28 SOIC 3.4MHz Surface Mount - -
RS Stock No. 669-6458
Mfr. Part No.MCP23016-I/SO
BrandMicrochip
HK$14.918
Each (In a Pack of 5)
units
16 I2C 28 SOIC 1MHz Surface Mount - -
RS Stock No. 190-6980
Mfr. Part No.MAX7311ATG+
HK$46.63
Each (In a Pack of 2)
units
- - - - - - - -
RS Stock No. 177-3316
Mfr. Part No.MCP23017T-E/SS
BrandMicrochip
HK$11.865
Each (In a Pack of 10)
units
16 I2C 28 SSOP 10MHz Surface Mount 5.5 V 1.8 V