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. 797-4728
Mfr. Part No.PCA9555D,118
BrandNXP
MYR7.23
Each (In a Pack of 2)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 727-5624
Mfr. Part No.PCA9505DGG,112
BrandNXP
MYR16.21
Each
units
- - - TSSOP 100 kHz, 400 kHz Surface Mount 5 V 2.3 V
RS Stock No. 166-0161
Mfr. Part No.PCA9555D,118
BrandNXP
MYR6.583
Each (On a Reel of 1000)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2337
Mfr. Part No.P82B715TD,112
BrandNXP
MYR10.43
Each (In a Tube of 100)
units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - -
RS Stock No. 273-539
Mfr. Part No.P82B715TD,112
BrandNXP
MYR14.11
Each
units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - -
RS Stock No. 124-2364
Mfr. Part No.PCF8574T/3,512
BrandNXP
MYR4.929
Each (In a Tube of 48)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 510-780
Mfr. Part No.PCF8574T/3,512
BrandNXP
MYR5.772
Each (In a Pack of 5)
units
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 511-068
Mfr. Part No.PCA9698DGG,512
BrandNXP
MYR20.14
Each
units
40 - 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2361
Mfr. Part No.PCA9698DGG,512
BrandNXP
MYR17.14
Each (In a Tube of 35)
units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS Stock No. 103-8075
Mfr. Part No.PCA9535BS,118
BrandNXP
MYR4.268
Each (On a Reel of 6000)
units
- - - HVQFN - Surface Mount - -
RS Stock No. 124-2352
Mfr. Part No.PCA9539PW,112
BrandNXP
MYR8.637
Each (In a Tube of 63)
units
- - 24 TSSOP - Surface Mount - -
RS Stock No. 727-5670
Mfr. Part No.PCA9518PW,112
BrandNXP
MYR10.785
Each (In a Pack of 2)
units
- - - TSSOP - Surface Mount - -
RS Stock No. 510-841
Mfr. Part No.PCA9539PW,112
BrandNXP
MYR10.98
Each (In a Pack of 5)
units
- - 24 TSSOP - Surface Mount - -
RS Stock No. 103-5691
Mfr. Part No.PCA9554D,112
BrandNXP
MYR6.355
Each (In a Tube of 48)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount - -
RS Stock No. 483-7187
Mfr. Part No.PCA9554PW,112
BrandNXP
MYR6.38
Each (In a Pack of 5)
units
- - 16 TSSOP - Surface Mount - -
RS Stock No. 103-8074
Mfr. Part No.PCA9518PW,112
BrandNXP
MYR9.137
Each (In a Tube of 75)
units
- - - TSSOP - Surface Mount - -
RS Stock No. 727-5692
Mfr. Part No.PCA9539BS,118
BrandNXP
MYR8.10
Each (In a Pack of 2)
units
- - - HVQFN - Surface Mount - -
RS Stock No. 436-8344
Mfr. Part No.PCF8575TS/1,112
BrandNXP
MYR8.58
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
MYR7.368
Each (In a Tube of 59)
units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 166-1598
Mfr. Part No.PCA9536DP,118
BrandNXP
MYR2.649
Each (On a Reel of 2500)
units
4 I2C, SMBus 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V