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. 190-7057
Mfr. Part No.MAX7321ATE+
SGD3.82
Each (In a Pack of 5)
units
- - - - - - - -
RS Stock No. 189-7051
Mfr. Part No.MAX7301AAX+
SGD9.156
Each (In a Tube of 30)
units
- - 36 SSOP - Surface Mount - -
RS Stock No. 191-3240
Mfr. Part No.DS2482S-800+T&R
SGD7.861
Each (On a Reel of 2500)
units
8 I2C 16 SO 400kHz Surface Mount 5.5 V 4.5 V
RS Stock No. 190-7066
Mfr. Part No.MAX7300AAX+
SGD13.33
Each
units
- Serial I2C - SSOP - Surface Mount 5.5 V 2.5 V
RS Stock No. 190-7018
Mfr. Part No.MAX7312AUG+
SGD7.215
Each (In a Pack of 2)
units
- Serial I2C - TSSOP - Surface Mount 5.5 V 2 V
RS Stock No. 190-0469
Mfr. Part No.MAX7312ATG+
SGD7.58
Each (In a Pack of 2)
units
16 Serial-2 Wire 24 TQFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 190-6955
Mfr. Part No.MAX7311AAG+
SGD7.975
Each (In a Pack of 2)
units
- Serial I2C - SSOP - Surface Mount 5.5 V 2 V
RS Stock No. 190-7042
Mfr. Part No.MAX7300AAI+
SGD8.55
Each (In a Pack of 2)
units
- Serial I2C - SSOP - Surface Mount 5.5 V 2.5 V
RS Stock No. 190-7024
Mfr. Part No.DS4520E+
SGD4.274
Each (In a Pack of 5)
units
- Serial I2C - TSSOP - Surface Mount 5.5 V 2.7 V
RS Stock No. 190-6113
Mfr. Part No.MAX7312AUG+
SGD6.293
Each (In a Tube of 62)
units
16 Serial I2C 24 TSSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 190-7090
Mfr. Part No.MAX7300ATL+
SGD15.75
Each
units
- - - - - - - -
RS Stock No. 190-0596
Mfr. Part No.MAX7318ATG+
SGD7.21
Each (In a Pack of 2)
units
16 Serial-2 Wire 24 QFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 189-7055
Mfr. Part No.MAX7313ATG+
SGD5.03
Each (In a Tube of 75)
units
16 Serial-2 Wire 24 TQFN 400kHz Surface Mount 3.6 V 2 V
RS Stock No. 799-3160
Mfr. Part No.MAX7312AAG+
SGD6.425
Each (In a Pack of 2)
units
16 Serial-2 Wire 24 SSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 190-6111
Mfr. Part No.MAX7311ATG+
SGD6.343
Each (In a Tube of 75)
units
16 Serial I2C 24 TQFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 190-0530
Mfr. Part No.MAX7313ATG+
SGD6.985
Each (In a Pack of 2)
units
16 Serial I2C 24 TQFN 400kHz Surface Mount 3.6 V 2 V
RS Stock No. 799-3167
Mfr. Part No.MAX7311AWG+
SGD8.47
Each (In a Pack of 2)
units
16 Serial-2 Wire 24 SOIC 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 190-6114
Mfr. Part No.MAX7318AUG+
SGD5.44
Each (In a Tube of 62)
units
16 Serial I2C 24 TSSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 189-7053
Mfr. Part No.MAX7312ATG+
SGD5.537
Each (In a Tube of 75)
units
16 Serial-2 Wire 24 TQFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 190-6108
Mfr. Part No.MAX7301ATL+T
SGD6.93
Each (On a Reel of 2500)
units
28 Serial I2C 40 TQFN - Surface Mount 5.5 V 2.5 V