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. 661-3387
Mfr. Part No.PCF8574DWR
HK$12.84
Each (In a Pack of 5)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 517-0671
Mfr. Part No.PCF8574DW
HK$12.05
Each (In a Pack of 5)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 920-3374
Mfr. Part No.PCF8574AN
HK$10.18
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
HK$12.25
Each
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 178-9133
Mfr. Part No.PCF8574DW
HK$13.134
Each (In a Tube of 40)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 661-3380
Mfr. Part No.PCF8574PWR
HK$12.84
Each (In a Pack of 5)
units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 145-1322
Mfr. Part No.PCA9534DW
HK$14.72
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 661-3441
Mfr. Part No.PCA9535DW
HK$16.83
Each (In a Pack of 5)
units
- - 24 SOIC - Surface Mount - -
RS Stock No. 162-8708
Mfr. Part No.TCA6416ARTWR
HK$5.461
Each (On a Reel of 3000)
units
16 I2C, Serial 24 WQFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 168-5035
Mfr. Part No.TCA9554DBQR
HK$4.687
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. 661-3479
Mfr. Part No.PCF8575CPW
HK$27.64
Each (In a Pack of 5)
units
- - 24 TSSOP - Surface Mount - -
RS Stock No. 825-3508
Mfr. Part No.TCA6408ARSVR
HK$11.99
Each (In a Pack of 5)
units
8 I2C 16 QFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 825-3502
Mfr. Part No.TCA6416ARTWR
HK$13.35
Each (In a Pack of 5)
units
16 I2C, Serial 24 WQFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 732-1183
Mfr. Part No.PCF8574RGYR
HK$12.77
Each (In a Pack of 5)
units
8 I2C 20 VQFN 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 661-3368
Mfr. Part No.PCA9536DGKR
HK$11.04
Each (In a Pack of 5)
units
4 I2C, SMBus kHz 8 MSOP 400kHz Surface Mount - -
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. 825-3233
Mfr. Part No.PCA9534ADB
HK$14.824
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 162-7823
Mfr. Part No.PCA9534PW
HK$14.426
Each (In a Tube of 90)
units
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 732-1326
Mfr. Part No.PCF8574DGVR
HK$12.84
Each (On a Tape of 5)
units
8 I2C 20 TVSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 517-0261
Mfr. Part No.PCF8574APW
HK$13.09
Each
units
- - 20 TSSOP - Surface Mount - -