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. 517-0249
Mfr. Part No.PCF8574AN
kr 12,06
Each
Units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 920-3374
Mfr. Part No.PCF8574AN
kr 10,429
Each (In a Tube of 25)
Units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 169-5578
Mfr. Part No.PCA9538PW
kr 11,56
Each (In a Tube of 90)
Units
- - 16 TSSOP - Surface Mount - -
RS Stock No. 825-3274
Mfr. Part No.PCA9557D
kr 6,516
Each (In a Pack of 5)
Units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 145-6846
Mfr. Part No.PCA9534ADB
kr 8,987
Each (In a Tube of 80)
Units
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 517-0700
Mfr. Part No.PCF8574PW
kr 14,994
Each (In a Pack of 5)
Units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 661-3368
Mfr. Part No.PCA9536DGKR
kr 11,386
Each (In a Pack of 5)
Units
4 I2C, SMBus kHz 8 MSOP 400kHz Surface Mount - -
RS Stock No. 825-3246
Mfr. Part No.PCA9534DW
kr 17,826
Each (In a Pack of 5)
Units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 825-3505
Mfr. Part No.TCA6408ARGTR
kr 11,924
Each (In a Pack of 5)
Units
8 I2C 16 UQFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 168-5139
Mfr. Part No.PCF8574PW
kr 10,592
Each (In a Tube of 70)
Units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 825-3233
Mfr. Part No.PCA9534ADB
kr 8,974
Each (In a Pack of 5)
Units
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 814-3990
Mfr. Part No.TCA9554APWR
kr 9,89
Each (In a Pack of 10)
Units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 162-5477
Mfr. Part No.PCA9557PWR
kr 6,647
Each (On a Reel of 2000)
Units
- - 16 TSSOP - Surface Mount - -
RS Stock No. 162-7823
Mfr. Part No.PCA9534PW
kr 15,154
Each (In a Tube of 90)
Units
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 517-0671
Mfr. Part No.PCF8574DW
kr 14,994
Each (In a Pack of 5)
Units
- - 16 SOIC - Surface Mount - -
RS Stock No. 162-8708
Mfr. Part No.TCA6416ARTWR
kr 6,197
Each (On a Reel of 3000)
Units
16 I2C, Serial 24 WQFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 162-6382
Mfr. Part No.PCF8574RGYR
kr 5,985
Each (On a Reel of 3000)
Units
8 I2C 20 VQFN 100kHz Surface Mount 6 V 2.5 V
New
RS Stock No. 197-7469
Mfr. Part No.PCF8574N
kr 13,718
Each (In a Pack of 5)
Units
8 I2C 16 PDIP 100kHz - - -
RS Stock No. 145-1322
Mfr. Part No.PCA9534DW
kr 15,155
Each (In a Tube of 40)
Units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 162-5844
Mfr. Part No.PCF8575CPW
kr 25,578
Each (In a Tube of 60)
Units
- - 24 TSSOP - Surface Mount - -