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. 517-0249
Mfr. Part No.PCF8574AN
PHP72.98
Each
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 819-5575
Mfr. Part No.MCP23S17T-E/SS
BrandMicrochip
PHP52.50
Each (On a Reel of 2100)
units
16 Serial-SPI 28 SSOP 10MHz Surface Mount 5.5 V 4.5 V
RS Stock No. 819-5579
Mfr. Part No.MCP23S18T-E/MJ
BrandMicrochip
PHP63.53
Each (On a Reel of 3300)
units
16 Serial-SPI 24 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 861-0595
Mfr. Part No.MTCH652-I/SS
BrandMicrochip
PHP78.23
Each (In a Pack of 5)
units
19 Serial-SPI 28 SSOP 2MHz Surface Mount 5.5 V 1.8 V
New
RS Stock No. 190-6112
Mfr. Part No.MAX7311AUG+
PHP269.393
Each (In a Tube of 62)
units
16 Serial-I2C (2-Wire) 24 TSSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 133-0707
Mfr. Part No.TCA9554ADBR
PHP69.30
Each (In a Pack of 5)
units
8 I2C, Parallel 16 SSOP 100 (Standard) kHz, 400 (Fast) kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 178-9133
Mfr. Part No.PCF8574DW
PHP111.875
Each (In a Tube of 40)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 124-2352
Mfr. Part No.PCA9539PW,112
BrandNXP
PHP105.163
Each (In a Tube of 63)
units
- - 24 TSSOP - Surface Mount - -
RS Stock No. 145-0789
Mfr. Part No.PCA9557D
PHP77.70
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
New
RS Stock No. 197-7468
Mfr. Part No.PCF8574N
PHP80.091
Each (In a Tube of 25)
units
8 I2C 16 PDIP 100kHz - - -
RS Stock No. 789-3975
Mfr. Part No.CAT9554YI-GT2
PHP79.80
Each (On a Tape of 5)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 160-4440
Mfr. Part No.ADP5587ACPZ-R7
PHP86.924
Each (On a Reel of 1500)
units
18 I2C 24 LFCSP WQ 400kHz Surface Mount 3.6 V 1.65 V
RS Stock No. 177-3255
Mfr. Part No.MCP23017T-E/SO
BrandMicrochip
PHP63.40
Each (In a Pack of 10)
units
16 I2C 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 823-4220
Mfr. Part No.PCA9535ECMTTXG
PHP91.88
Each (In a Pack of 10)
units
16 I2C 24 QFN 1MHz Surface Mount 5.5 V 1.65 V
New
RS Stock No. 190-6105
Mfr. Part No.MAX7300AAI+
PHP276.971
Each (In a Tube of 46)
units
20 Serial-I2C (2-Wire) 28 SSOP 400kHz Surface Mount 5.5 V 2.5 V
New
RS Stock No. 190-6113
Mfr. Part No.MAX7312AUG+
PHP231.072
Each (In a Tube of 62)
units
16 Serial-I2C (2-Wire) 24 TSSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 796-8495
Mfr. Part No.XIO2001IZGU
PHP336.53
Each
units
16 Serial-2 Wire 169 BGA 66MHz Surface Mount 3.6 V 3 V
RS Stock No. 661-3380
Mfr. Part No.PCF8574PWR
PHP78.75
Each (In a Pack of 5)
units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 732-1064
Mfr. Part No.PCF8574ADGVR
PHP68.452
Each (On a Tape of 5)
units
8 I2C 20 TVSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 166-0320
Mfr. Part No.PCA9554BS,118
BrandNXP
PHP45.263
Each (On a Reel of 6000)
units
8 I2C, SMBus 16 HVQFN 400kHz Surface Mount 5.5 V 2.3 V
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