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. 436-8344
Mfr. Part No.PCF8575TS/1,112
BrandNXP
PHP126.40
Each
units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 511-068
Mfr. Part No.PCA9698DGG,512
BrandNXP
PHP291.02
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
PHP287.556
Each (In a Tube of 35)
units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS Stock No. 166-0161
Mfr. Part No.PCA9555D,118
BrandNXP
PHP115.123
Each (On a Reel of 1000)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2366
Mfr. Part No.PCF8575TS/1,112
BrandNXP
PHP112.107
Each (In a Tube of 59)
units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 797-4728
Mfr. Part No.PCA9555D,118
BrandNXP
PHP145.245
Each (In a Pack of 2)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2356
Mfr. Part No.PCA9555PW,112
BrandNXP
PHP79.233
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
PHP90.04
Each
units
16 I2C, SMBus 24 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2351
Mfr. Part No.PCA9535PW,112
BrandNXP
PHP84.092
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
PHP95.834
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. 483-7109
Mfr. Part No.PCA9535D,112
BrandNXP
PHP94.788
Each (In a Pack of 5)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount - -
RS Stock No. 103-5690
Mfr. Part No.PCA9535D,112
BrandNXP
PHP78.75
Each (In a Tube of 30)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount - -
RS Stock No. 483-7193
Mfr. Part No.PCA9555D,112
BrandNXP
PHP99.75
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
PHP91.581
Each (In a Tube of 30)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 815-0683
Mfr. Part No.PCA9554DB,112
BrandNXP
PHP80.262
Each (In a Pack of 6)
units
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 166-0320
Mfr. Part No.PCA9554BS,118
BrandNXP
PHP48.668
Each (On a Reel of 6000)
units
8 I2C, SMBus 16 HVQFN 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 103-8074
Mfr. Part No.PCA9518PW,112
BrandNXP
PHP111.246
Each (In a Tube of 75)
units
- I2C - TSSOP - Surface Mount - -
RS Stock No. 510-914
Mfr. Part No.PCA9536DP,118
BrandNXP
PHP57.23
Each (In a Pack of 5)
units
4 I2C, SMBus 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 103-8075
Mfr. Part No.PCA9535BS,118
BrandNXP
PHP61.74
Each (On a Reel of 6000)
units
- I2C, SMBus - HVQFN - Surface Mount - -
RS Stock No. 483-7187
Mfr. Part No.PCA9554PW,112
BrandNXP
PHP81.90
Each (In a Pack of 5)
units
- I2C 16 TSSOP - Surface Mount - -