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. 403-806
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
PHP64.26
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 144-5723
Mfr. Part No.MCP23017-E/SP
BrandMicrochip
PHP63.00
Each (In a Tube of 15)
units
16 I2C, Serial MHz 28 SPDIP 5MHz Through Hole - -
RS Stock No. 889-5128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
PHP56.233
Each (In a Tube of 47)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 681-1128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
PHP66.47
Each (In a Pack of 2)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 436-8344
Mfr. Part No.PCF8575TS/1,112
BrandNXP
PHP114.60
Each
units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 166-0161
Mfr. Part No.PCA9555D,118
BrandNXP
PHP85.959
Each (On a Reel of 1000)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 797-4728
Mfr. Part No.PCA9555D,118
BrandNXP
PHP94.55
Each (In a Pack of 2)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 511-068
Mfr. Part No.PCA9698DGG,512
BrandNXP
PHP258.83
Each
units
40 - 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS Stock No. 124-2366
Mfr. Part No.PCF8575TS/1,112
BrandNXP
PHP95.55
Each (In a Tube of 59)
units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 124-2361
Mfr. Part No.PCA9698DGG,512
BrandNXP
PHP219.98
Each (In a Tube of 35)
units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS Stock No. 165-4811
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
PHP83.34
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS Stock No. 681-1143
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
PHP84.61
Each (In a Pack of 2)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS Stock No. 889-5109
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
PHP52.50
Each (In a Tube of 27)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 403-816
Mfr. Part No.MCP23017-E/SO
BrandMicrochip
PHP63.40
Each (In a Pack of 5)
units
16 I2C, Serial MHz 28 SOIC 5MHz Surface Mount - -
RS Stock No. 124-2356
Mfr. Part No.PCA9555PW,112
BrandNXP
PHP73.50
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
PHP86.63
Each
units
16 I2C, SMBus 24 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 732-1326
Mfr. Part No.PCF8574DGVR
PHP78.75
Each (On a Tape of 5)
units
8 I2C 20 TVSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 162-6381
Mfr. Part No.PCF8574DGVR
PHP73.052
Each (On a Reel of 2000)
units
8 I2C 20 TVSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 814-3990
Mfr. Part No.TCA9554APWR
PHP58.80
Each (In a Pack of 10)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 162-8358
Mfr. Part No.TCA9554APWR
PHP38.302
Each (On a Reel of 2000)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 1.65 V