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. 162-8706
Mfr. Part No.TCA6408ARGTR
PHP61.206
Each (On a Reel of 3000)
units
8 I2C 16 UQFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 669-6458
Mfr. Part No.MCP23016-I/SO
BrandMicrochip
PHP84.608
Each (In a Pack of 5)
units
16 I2C 28 SOIC 1MHz Surface Mount - -
RS Stock No. 190-0469
Mfr. Part No.MAX7312ATG+
PHP248.50
Each (In a Pack of 2)
units
16 Serial-2 Wire 24 TQFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 162-5843
Mfr. Part No.PCA9535DW
PHP122.85
Each (In a Tube of 25)
units
- - 24 SOIC - Surface Mount - -
New
RS Stock No. 190-7090
Mfr. Part No.MAX7300ATL+
PHP517.10
Each
units
- - - - - - - -
RS Stock No. 825-3502
Mfr. Part No.TCA6416ARTWR
PHP81.90
Each (In a Pack of 5)
units
16 I2C, Serial 24 WQFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 823-4220
Mfr. Part No.PCA9535ECMTTXG
PHP91.88
Each (In a Pack of 10)
units
16 I2C 24 QFN 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 403-894
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
PHP66.47
Each (In a Pack of 5)
units
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS Stock No. 166-0319
Mfr. Part No.PCA9539BS,118
BrandNXP
PHP66.05
Each (On a Reel of 6000)
units
- - - HVQFN - Surface Mount - -
RS Stock No. 145-1322
Mfr. Part No.PCA9534DW
PHP90.30
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
New
RS Stock No. 190-6110
Mfr. Part No.MAX7311AAG+
PHP239.467
Each (In a Tube of 58)
units
16 Serial-I2C (2-Wire) 24 SSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 517-0671
Mfr. Part No.PCF8574DW
PHP97.65
Each (In a Pack of 5)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 510-914
Mfr. Part No.PCA9536DP,118
BrandNXP
PHP57.23
Each (In a Pack of 5)
units
4 - 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
New
RS Stock No. 191-3756
Mfr. Part No.DS2482S-800+T&R
PHP467.40
Each
units
8 I2C 16 SO 400kHz Surface Mount 5.5 V 4.5 V
New
RS Stock No. 190-6104
Mfr. Part No.DS4520E+
PHP141.51
Each (In a Tube of 96)
units
9 Serial I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.7 V
RS Stock No. 912-6833
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
PHP66.15
Each (In a Tube of 15)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 177-3316
Mfr. Part No.MCP23017T-E/SS
BrandMicrochip
PHP66.47
Each (In a Pack of 10)
units
16 I2C 28 SSOP 10MHz Surface Mount 5.5 V 1.8 V
New
RS Stock No. 190-6106
Mfr. Part No.MAX7300AAX+
PHP448.751
Each (In a Tube of 30)
units
28 Serial-I2C (2-Wire) 36 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 177-3187
Mfr. Part No.MCP23008T-E/SO
BrandMicrochip
PHP53.69
Each (In a Pack of 10)
units
8 I2C 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
New
RS Stock No. 191-3240
Mfr. Part No.DS2482S-800+T&R
PHP276.675
Each (On a Reel of 2500)
units
8 I2C 16 SO 400kHz Surface Mount 5.5 V 4.5 V
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