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
New
RS Stock No. 189-7059
Mfr. Part No.MAX7318ATG+
PHP177.507
Each (In a Tube of 75)
units
16 Serial-2 Wire 24 QFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 162-8707
Mfr. Part No.TCA6408ARSVR
PHP61.206
Each (On a Reel of 3000)
units
8 I2C 16 QFN 400kHz Surface Mount 5.5 V 1.65 V
New
RS Stock No. 190-6113
Mfr. Part No.MAX7312AUG+
PHP206.595
Each (In a Tube of 62)
units
16 - 24 TSSOP 400kHz Surface Mount 5.5 V 2 V
New
RS Stock No. 193-8488
Mfr. Part No.CY8C9560A-24AXI
PHP740.152
Each (In a Tray of 90)
units
60 I2C 100 TQFP 100kHz Surface Mount 5.25 V 3 V
RS Stock No. 169-7286
Mfr. Part No.PCA9554DB,112
BrandNXP
PHP56.052
Each (In a Tube of 78)
units
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 403-812
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
PHP56.24
Each (In a Pack of 5)
units
8 SPI 18 SOIC 10MHz Surface Mount - -
New
RS Stock No. 190-0419
Mfr. Part No.MAX7301AAX+
PHP418.50
Each (In a Pack of 2)
units
- - 36 SSOP - Surface Mount - -
RS Stock No. 163-0307
Mfr. Part No.PCA9535ECDWR2G
PHP52.479
Each (On a Reel of 1000)
units
16 I2C 24 SOIC 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 177-3187
Mfr. Part No.MCP23008T-E/SO
BrandMicrochip
PHP53.69
Each (In a Pack of 10)
units
8 I2C 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 145-6521
Mfr. Part No.PCF8574APW
PHP67.404
Each (In a Tube of 70)
units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 178-3989
Mfr. Part No.MCP23S18-E/MJ
BrandMicrochip
PHP70.048
Each (In a Tube of 91)
units
16 Serial-SPI 24 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 825-3274
Mfr. Part No.PCA9557D
PHP90.042
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 177-2845
Mfr. Part No.MCP23008T-E/SO
BrandMicrochip
PHP41.078
Each (On a Reel of 1100)
units
8 I2C 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 661-3488
Mfr. Part No.PCF8575DW
PHP143.778
Each (In a Pack of 5)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount - -
New
RS Stock No. 190-6112
Mfr. Part No.MAX7311AUG+
PHP269.393
Each (In a Tube of 62)
units
16 - 24 TSSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 103-8075
Mfr. Part No.PCA9535BS,118
BrandNXP
PHP49.516
Each (On a Reel of 6000)
units
- - - HVQFN - Surface Mount - -
RS Stock No. 162-8683
Mfr. Part No.PCA9554DW
PHP96.726
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 168-5033
Mfr. Part No.TCA9538DBR
PHP40.244
Each (On a Reel of 2000)
units
8 I2C, Parallel 16 SSOP 100 (Standard) kHz, 400 (Fast) kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 669-6452
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
PHP67.914
Each (In a Pack of 5)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 727-5692
Mfr. Part No.PCA9539BS,118
BrandNXP
PHP103.95
Each (In a Pack of 2)
units
- - - HVQFN - Surface Mount - -
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