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. 517-0671
Mfr. Part No.PCF8574DW
HK$16.444
Each (In a Pack of 5)
units
- I2C 16 SOIC - Surface Mount - -
RS Stock No. 178-9133
Mfr. Part No.PCF8574DW
HK$12.857
Each (In a Tube of 40)
units
- I2C 16 SOIC - Surface Mount - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
HK$25.25
Each
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
New
RS Stock No. 922-3338
Mfr. Part No.PCF8574DWR
HK$6.064
Each (On a Reel of 2000)
units
- - - - - - - -
RS Stock No. 920-3374
Mfr. Part No.PCF8574AN
HK$12.128
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 133-0706
Mfr. Part No.TCA9538DBR
HK$13.744
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. 661-3475
Mfr. Part No.PCF8575CDW
HK$29.274
Each (In a Pack of 5)
units
- I2C, SMBus 24 SOIC - Surface Mount - -
RS Stock No. 168-5139
Mfr. Part No.PCF8574PW
HK$13.629
Each (In a Tube of 70)
units
- I2C 20 TSSOP - Surface Mount - -
RS Stock No. 517-0233
Mfr. Part No.PCF8574ADW
HK$16.41
Each
units
- I2C 16 SOIC - Surface Mount - -
RS Stock No. 661-3374
Mfr. Part No.PCF8574ADWRG4
HK$16.80
Each (In a Pack of 5)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 162-6380
Mfr. Part No.PCF8574ADGVR
HK$4.553
Each (On a Reel of 2000)
units
8 I2C 20 TVSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 825-3274
Mfr. Part No.PCA9557D
HK$14.90
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 661-3488
Mfr. Part No.PCF8575DW
HK$27.132
Each (In a Pack of 5)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount - -
RS Stock No. 162-7823
Mfr. Part No.PCA9534PW
HK$12.69
Each (In a Tube of 90)
units
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 133-0708
Mfr. Part No.TCA9554DBQR
HK$13.03
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. 133-0707
Mfr. Part No.TCA9554ADBR
HK$11.77
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. 825-3233
Mfr. Part No.PCA9534ADB
HK$14.79
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 922-3362
Mfr. Part No.PCF8575DW
HK$21.331
Each (In a Tube of 25)
units
- - - - - - - -
RS Stock No. 145-1321
Mfr. Part No.PCA9538DW
HK$13.35
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 168-5033
Mfr. Part No.TCA9538DBR
HK$5.576
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