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. 920-3374
Mfr. Part No.PCF8574AN
HK$9.976
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$12.584
Each (In a Pack of 5)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
HK$17.09
Each
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 920-3393
Mfr. Part No.PCF8574N
HK$11.319
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP - Through Hole - -
RS Stock No. 517-0687
Mfr. Part No.PCF8574N
HK$13.338
Each (In a Pack of 5)
units
8 I2C, SMBus 16 PDIP - Through Hole - -
RS Stock No. 145-0789
Mfr. Part No.PCA9557D
HK$12.407
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 796-8495
Mfr. Part No.XIO2001IZGU
HK$54.23
Each
units
16 Serial-2 Wire 169 BGA 66MHz Surface Mount 3.6 V 3 V
RS Stock No. 661-3479
Mfr. Part No.PCF8575CPW
HK$27.088
Each (In a Pack of 5)
units
- - 24 TSSOP - Surface Mount - -
RS Stock No. 825-3265
Mfr. Part No.PCA9554DW
HK$18.532
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 145-1321
Mfr. Part No.PCA9538DW
HK$13.083
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 162-8354
Mfr. Part No.TCA6416APWR
HK$5.461
Each (On a Reel of 2000)
units
16 I2C, SMBus 24 TSSOP 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 162-8706
Mfr. Part No.TCA6408ARGTR
HK$9.166
Each (On a Reel of 3000)
units
8 I2C 16 UQFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 145-1322
Mfr. Part No.PCA9534DW
HK$14.426
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 162-8707
Mfr. Part No.TCA6408ARSVR
HK$4.762
Each (On a Reel of 3000)
units
8 I2C 16 QFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 825-3502
Mfr. Part No.TCA6416ARTWR
HK$13.084
Each (In a Pack of 5)
units
16 I2C, Serial 24 WQFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 145-6846
Mfr. Part No.PCA9534ADB
HK$9.271
Each (In a Tube of 80)
units
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 145-6521
Mfr. Part No.PCF8574APW
HK$10.986
Each (In a Tube of 70)
units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 162-8358
Mfr. Part No.TCA9554APWR
HK$6.123
Each (On a Reel of 2000)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 825-3508
Mfr. Part No.TCA6408ARSVR
HK$11.828
Each (In a Pack of 5)
units
8 I2C 16 QFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 812-2666
Mfr. Part No.PCA9534PW
HK$16.94
Each
units
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V