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 Priced to Clear
RS Stock No. 483-7193
Mfr. Part No.PCA9555D,112
BrandNXP
£1.67
Each
Units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 770-9732
Mfr. Part No.MCP23S09-E/MG
BrandMicrochip
£1.01
Each (In a Pack of 5)
Units
8 Serial-SPI 16 QFN 10MHz Surface Mount 5.5 V 1.8 V -
RS Stock No. 797-4728
Mfr. Part No.PCA9555D,118
BrandNXP
£1.84
Each (In a Pack of 2)
Units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 825-3274
Mfr. Part No.PCA9557D
£0.55
Each (In a Pack of 5)
Units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 145-0789
Mfr. Part No.PCA9557D
£0.561
Each (In a Tube of 40)
Units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 178-3989
Mfr. Part No.MCP23S18-E/MJ
BrandMicrochip
£1.02
Each (In a Tube of 91)
Units
16 Serial-SPI 24 QFN 10MHz Surface Mount 5.5 V 1.8 V -
RS Stock No. 103-5691
Mfr. Part No.PCA9554D,112
BrandNXP
£0.943
Each (In a Tube of 48)
Units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount - - -
RS Stock No. 770-9739
Mfr. Part No.MCP23S18-E/MJ
BrandMicrochip
£1.27
Each (In a Pack of 3)
Units
16 Serial-SPI 24 QFN 10MHz Surface Mount 5.5 V 1.8 V -
RS Stock No. 669-6458
Mfr. Part No.MCP23016-I/SO
BrandMicrochip
£1.258
Each (In a Pack of 5)
Units
16 I2C 28 SOIC 1MHz Surface Mount - - -
RS Stock No. 687-8770
Mfr. Part No.MCP23S08-E/SS
BrandMicrochip
£0.94
Each
Units
8 SPI 20 SSOP 10MHz Surface Mount - - -
RS Stock No. 887-7432
Mfr. Part No.MCP23S08-E/SS
BrandMicrochip
£0.732
Each (In a Tube of 67)
Units
8 SPI 20 SSOP 10MHz Surface Mount - - -
RS Stock No. 125-4198
Mfr. Part No.CY8C9540A-24PVXI
£7.66
Each
Units
40 I2C 48 SSOP 100kHz Surface Mount 5.25 V 3 V -
RS Stock No. 168-5033
Mfr. Part No.TCA9538DBR
£0.142
Each (On a Reel of 2000)
Units
8 I2C, Parallel 16 SSOP 100 (Standard) kHz, 400 (Fast) kHz Surface Mount 5.5 V 1.65 V -
RS Stock No. 887-7426
Mfr. Part No.MCP23016-I/SO
BrandMicrochip
£1.01
Each (In a Tube of 27)
Units
16 I2C 28 SOIC 1MHz Surface Mount - - -
RS Stock No. 661-3374
Mfr. Part No.PCF8574ADWRG4
£1.314
Each (In a Pack of 5)
Units
- - 16 SOIC - Surface Mount - - -
RS Stock No. 661-3475
Mfr. Part No.PCF8575CDW
£2.792
Each (In a Pack of 5)
Units
- I2C, SMBus 24 SOIC - Surface Mount - - -
RS Stock No. 124-9971
Mfr. Part No.CAT9554YI-GT2
£0.513
Each (On a Reel of 2000)
Units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 920-3371
Mfr. Part No.PCF8574ADW
£1.152
Each (In a Tube of 40)
Units
- I2C 16 SOIC - Surface Mount - - -
RS Stock No. 133-0706
Mfr. Part No.TCA9538DBR
£0.178
Each (In a Pack of 5)
Units
8 I2C, Parallel 16 SSOP 100 (Standard) kHz, 400 (Fast) kHz Surface Mount 5.5 V 1.65 V Yes
RS Stock No. 922-3356
Mfr. Part No.PCF8575CDW
£2.37
Each (In a Tube of 25)
Units
- - - - - - - - -