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. 162-8358
Mfr. Part No.TCA9554APWR
PHP38.302
Each (On a Reel of 2000)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 814-3990
Mfr. Part No.TCA9554APWR
PHP61.226
Each (In a Pack of 10)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
PHP188.05
Each
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 920-3374
Mfr. Part No.PCF8574AN
PHP180.914
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 162-5477
Mfr. Part No.PCA9557PWR
PHP73.052
Each (On a Reel of 2000)
units
- - 16 TSSOP - Surface Mount - -
RS Stock No. 168-5033
Mfr. Part No.TCA9538DBR
PHP40.244
Each (On a Reel of 2000)
units
8 I2C, Parallel 16 SSOP 100 (Standard) kHz, 400 (Fast) kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 133-0706
Mfr. Part No.TCA9538DBR
PHP78.718
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. 517-0233
Mfr. Part No.PCF8574ADW
PHP94.31
Each
units
- I2C 16 SOIC - Surface Mount - -
RS Stock No. 825-3274
Mfr. Part No.PCA9557D
PHP91.88
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 133-0708
Mfr. Part No.TCA9554DBQR
PHP74.602
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. 145-1321
Mfr. Part No.PCA9538DW
PHP81.90
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 661-3371
Mfr. Part No.PCA9557PWR
PHP71.002
Each (In a Pack of 5)
units
- - 16 TSSOP - Surface Mount - -
RS Stock No. 922-3362
Mfr. Part No.PCF8575DW
PHP171.419
Each (In a Tube of 25)
units
- - - - - - - -
RS Stock No. 162-7823
Mfr. Part No.PCA9534PW
PHP295.39
Each (In a Tube of 90)
units
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 168-5035
Mfr. Part No.TCA9554DBQR
PHP38.275
Each (On a Reel of 2500)
units
8 I2C, Parallel 16 SSOP 100 (Standard) kHz, 400 (Fast) kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 920-3371
Mfr. Part No.PCF8574ADW
PHP80.777
Each (In a Tube of 40)
units
- I2C 16 SOIC - Surface Mount - -
RS Stock No. 517-0700
Mfr. Part No.PCF8574PW
PHP122.116
Each (In a Pack of 5)
units
- I2C 20 TSSOP - Surface Mount - -
RS Stock No. 922-3356
Mfr. Part No.PCF8575CDW
PHP216.772
Each (In a Tube of 25)
units
- - - - - - - -
RS Stock No. 661-3488
Mfr. Part No.PCF8575DW
PHP155.38
Each (In a Pack of 5)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount - -
RS Stock No. 197-7469
Mfr. Part No.PCF8574N
PHP94.784
Each (In a Pack of 5)
units
8 I2C 16 PDIP 100kHz - - -