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. 193-8488
Mfr. Part No.CY8C9560A-24AXI
TWD226.20
Each (In a Tray of 90)
units
60 I2C 100 TQFP 100kHz Surface Mount 5.25 V 3 V
RS Stock No. 125-4198
Mfr. Part No.CY8C9540A-24PVXI
TWD285.00
Each
units
40 I2C 48 SSOP 100kHz Surface Mount 5.25 V 3 V
RS Stock No. 193-8490
Mfr. Part No.CY8C9560A-24AXI
TWD290.00
Each
units
60 I2C 100 TQFP 100kHz Surface Mount 5.25 V 3 V
RS Stock No. 125-4197
Mfr. Part No.CY8C9520A-24PVXI
TWD157.00
Each (In a Pack of 2)
units
20 I2C 28 SSOP 100kHz Surface Mount 5.25 V 3 V
RS Stock No. 188-5383
Mfr. Part No.CY8C9540A-24PVXI
TWD233.60
Each (In a Tube of 30)
units
40 I2C 48 SSOP 24MHz Surface Mount 5.25 V 3 V
RS Stock No. 188-5382
Mfr. Part No.CY8C9520A-24PVXI
TWD126.40
Each (In a Tube of 47)
units
20 I2C 28 SSOP 24MHz Surface Mount 5.25 V 3 V