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. 887-7319
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
£0.839
Each (In a Tube of 47)
Units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - - -
RS Stock No. 889-5128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
£0.80
Each (In a Tube of 47)
Units
16 I2C 28 SSOP 1.7MHz Surface Mount - - -
RS Stock No. 510-857
Mfr. Part No.PCA9535PW,112
BrandNXP
£1.506
Each (In a Pack of 5)
Units
16 I2C, SMBus 24 TSSOP 400kHz Surface Mount 5 V, 5.5 V 2.3 V -
RS Stock No. 124-2351
Mfr. Part No.PCA9535PW,112
BrandNXP
£1.277
Each (In a Tube of 63)
Units
16 I2C, SMBus 24 TSSOP 400kHz Surface Mount 5 V, 5.5 V 2.3 V -
RS Stock No. 770-9723
Mfr. Part No.MCP23S08-E/ML
BrandMicrochip
£1.26
Each (In a Pack of 5)
Units
8 Serial-SPI 20 QFN 10MHz Surface Mount 5.5 V 1.8 V -
RS Stock No. 165-2079
Mfr. Part No.MCP23S08-E/ML
BrandMicrochip
£0.783
Each (In a Tube of 91)
Units
8 Serial-SPI 20 QFN 10MHz Surface Mount 5.5 V 1.8 V -
RS Stock No. 770-9735
Mfr. Part No.MCP23S17-E/ML
BrandMicrochip
£1.207
Each (In a Pack of 3)
Units
16 Serial-SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V -
RS Stock No. 165-2102
Mfr. Part No.MCP23S17-E/ML
BrandMicrochip
£0.963
Each (In a Tube of 61)
Units
16 Serial-SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V -
RS Stock No. 511-068
Mfr. Part No.PCA9698DGG,512
BrandNXP
£4.42
Each
Units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 124-2361
Mfr. Part No.PCA9698DGG,512
BrandNXP
£3.754
Each (In a Tube of 35)
Units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 124-2366
Mfr. Part No.PCF8575TS/1,112
BrandNXP
£1.549
Each (In a Tube of 59)
Units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V -
RS Stock No. 436-8344
Mfr. Part No.PCF8575TS/1,112
BrandNXP
£1.83
Each
Units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V -
RS Stock No. 166-0320
Mfr. Part No.PCA9554BS,118
BrandNXP
£0.616
Each (On a Reel of 6000)
Units
8 I2C, SMBus 16 HVQFN 400kHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 145-6521
Mfr. Part No.PCF8574APW
£0.978
Each (In a Tube of 70)
Units
- I2C 20 TSSOP - Surface Mount - - -
RS Stock No. 727-5703
Mfr. Part No.PCA9554BS,118
BrandNXP
£1.355
Each (In a Pack of 2)
Units
8 I2C, SMBus 16 HVQFN 400kHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 124-2356
Mfr. Part No.PCA9555PW,112
BrandNXP
£1.255
Each (In a Tube of 63)
Units
16 I2C, SMBus 24 TSSOP 400kHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 483-7222
Mfr. Part No.PCA9555PW,112
BrandNXP
£1.48
Each
Units
16 I2C, SMBus 24 TSSOP 400kHz Surface Mount 5.5 V 2.3 V -
RS Stock No. 889-5323
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
£0.648
Each (In a Tube of 42)
Units
8 I2C, Serial 18 SOIC 5MHz Surface Mount - - -
RS Stock No. 403-642
Mfr. Part No.MCP23008-E/SO
BrandMicrochip
£0.816
Each (In a Pack of 5)
Units
8 I2C, Serial 18 SOIC 5MHz Surface Mount - - -
RS Stock No. 125-4197
Mfr. Part No.CY8C9520A-24PVXI
£4.22
Each (In a Pack of 2)
Units
20 I2C 28 SSOP 100kHz Surface Mount 5.25 V 3 V -