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. 103-5691
Mfr. Part No.PCA9554D,112
BrandNXP
SGD2.14
Each (In a Tube of 48)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount - -
RS Stock No. 483-7171
Mfr. Part No.PCA9554D,112
BrandNXP
SGD2.53
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 510-780
Mfr. Part No.PCF8574T/3,512
BrandNXP
SGD2.386
Each (In a Pack of 5)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2364
Mfr. Part No.PCF8574T/3,512
BrandNXP
SGD1.535
Each (In a Tube of 48)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 436-8344
Mfr. Part No.PCF8575TS/1,112
BrandNXP
SGD3.34
Each
units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 124-2366
Mfr. Part No.PCF8575TS/1,112
BrandNXP
SGD2.825
Each (In a Tube of 59)
units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 103-8075
Mfr. Part No.PCA9535BS,118
BrandNXP
SGD1.459
Each (On a Reel of 6000)
units
- I2C, SMBus - HVQFN - Surface Mount - -
RS Stock No. 797-4728
Mfr. Part No.PCA9555D,118
BrandNXP
SGD3.255
Each (In a Pack of 2)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 166-0161
Mfr. Part No.PCA9555D,118
BrandNXP
SGD2.586
Each (On a Reel of 1000)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2351
Mfr. Part No.PCA9535PW,112
BrandNXP
SGD2.215
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. 510-857
Mfr. Part No.PCA9535PW,112
BrandNXP
SGD2.67
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. 727-5680
Mfr. Part No.PCA9535BS,118
BrandNXP
SGD2.67
Each (In a Pack of 2)
units
- I2C, SMBus - HVQFN - Surface Mount - -
RS Stock No. 483-7187
Mfr. Part No.PCA9554PW,112
BrandNXP
SGD2.35
Each (In a Pack of 5)
units
- I2C 16 TSSOP - Surface Mount - -
RS Stock No. 103-8078
Mfr. Part No.PCA9555BS,118
BrandNXP
SGD2.079
Each (On a Reel of 6000)
units
16 I2C, SMBus 24 HVQFN 400kHz Surface Mount - -
RS Stock No. 483-7193
Mfr. Part No.PCA9555D,112
BrandNXP
SGD3.05
Each
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2355
Mfr. Part No.PCA9555D,112
BrandNXP
SGD2.361
Each (In a Tube of 30)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2365
Mfr. Part No.PCF8574TS/3,112
BrandNXP
SGD1.914
Each (In a Tube of 75)
units
8 I2C 20 SSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 510-841
Mfr. Part No.PCA9539PW,112
BrandNXP
SGD4.158
Each (In a Pack of 5)
units
- I2C, SMBus 24 TSSOP - Surface Mount - -
RS Stock No. 124-2352
Mfr. Part No.PCA9539PW,112
BrandNXP
SGD2.753
Each (In a Tube of 63)
units
- I2C, SMBus 24 TSSOP - Surface Mount - -
RS Stock No. 727-5706
Mfr. Part No.PCA9554ABS,118
BrandNXP
SGD2.425
Each (On a Tape of 2)
units
- I2C, SMBus - HVQFN - Surface Mount - -