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. 124-9971
Mfr. Part No.CAT9554YI-GT2
HK$5.356
Each (On a Reel of 2000)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 823-4223
Mfr. Part No.PCA9535ECDTR2G
HK$13.217
Each (In a Pack of 10)
units
16 I2C 24 TSSOP 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 823-4220
Mfr. Part No.PCA9535ECMTTXG
HK$9.813
Each (In a Pack of 10)
units
16 I2C 24 QFN 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 862-9249
Mfr. Part No.FXL6408UMX
HK$6.741
Each (In a Pack of 10)
units
8 I2C 16 UMLP 400kHz Surface Mount 3.6 V 1.65 V
RS Stock No. 163-0308
Mfr. Part No.PCA9535EDWR2G
HK$8.219
Each (On a Reel of 1000)
units
16 I2C 24 SOIC 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 789-3975
Mfr. Part No.CAT9554YI-GT2
HK$10.212
Each (On a Tape of 5)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 823-4232
Mfr. Part No.PCA9535EDWR2G
HK$11.592
Each (In a Pack of 10)
units
16 I2C 24 SOIC 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 121-7978
Mfr. Part No.PCA9535ECDTR2G
HK$8.055
Each (On a Reel of 2500)
units
16 I2C 24 TSSOP 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 823-4226
Mfr. Part No.PCA9535ECDWR2G
HK$14.12
Each (In a Pack of 10)
units
16 I2C 24 SOIC 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 121-7979
Mfr. Part No.PCA9535EMTTXG
HK$8.055
Each (On a Reel of 3000)
units
16 I2C 24 QFN 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 124-1424
Mfr. Part No.FXL6408UMX
HK$3.095
Each (On a Reel of 5000)
units
8 I2C 16 UMLP 400kHz Surface Mount 3.6 V 1.65 V
RS Stock No. 163-0307
Mfr. Part No.PCA9535ECDWR2G
HK$8.652
Each (On a Reel of 1000)
units
16 I2C 24 SOIC 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 823-4236
Mfr. Part No.PCA9535EMTTXG
HK$12.228
Each (In a Pack of 10)
units
16 I2C 24 QFN 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 124-5422
Mfr. Part No.PCA9535ECMTTXG
HK$7.771
Each (On a Reel of 3000)
units
16 I2C 24 QFN 1MHz Surface Mount 5.5 V 1.65 V