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. 517-0233
Mfr. Part No.PCF8574ADW
PHP74.32
Each
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 687-8480
Mfr. Part No.MCP23S09-E/SO
BrandMicrochip
PHP63.37
Each
units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 825-3246
Mfr. Part No.PCA9534DW
PHP106.05
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 661-3368
Mfr. Part No.PCA9536DGKR
PHP67.73
Each (In a Pack of 5)
units
4 I2C, SMBus kHz 8 MSOP 400kHz Surface Mount - -
RS Stock No. 165-2102
Mfr. Part No.MCP23S17-E/ML
BrandMicrochip
PHP66.367
Each (In a Tube of 61)
units
16 Serial-SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 189-7051
Mfr. Part No.MAX7301AAX+
PHP324.167
Each (In a Tube of 30)
units
- - 36 SSOP - Surface Mount - -
RS Stock No. 133-0706
Mfr. Part No.TCA9538DBR
PHP72.98
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. 145-1321
Mfr. Part No.PCA9538DW
PHP81.90
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 510-784
Mfr. Part No.PCF8574TS/3,112
BrandNXP
PHP74.67
Each
units
8 - 20 SSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 145-6521
Mfr. Part No.PCF8574APW
PHP68.78
Each (In a Tube of 70)
units
- - 20 TSSOP - Surface Mount - -
New
RS Stock No. 190-6115
Mfr. Part No.MAX7321ATE+
PHP83.998
Each (In a Tube of 100)
units
8 Serial-I2C (2-Wire) 16 TQFN 400kHz Surface Mount 5.5 V 1.71 V
RS Stock No. 912-5284
Mfr. Part No.MTCH652-I/MV
BrandMicrochip
PHP83.48
Each (In a Pack of 5)
units
19 Serial-3 Wire, Serial-SPI 28 UQFN 2MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-3338
Mfr. Part No.MCP23S08T-E/SO
BrandMicrochip
PHP61.047
Each (In a Pack of 10)
units
8 SPI 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 912-6763
Mfr. Part No.MCP23S18-E/SO
BrandMicrochip
PHP69.83
Each (In a Tube of 27)
units
16 SPI 28 SOIC 10MHz Surface Mount - -
New
RS Stock No. 191-3240
Mfr. Part No.DS2482S-800+T&R
PHP276.675
Each (On a Reel of 2500)
units
8 I2C 16 SO 400kHz Surface Mount 5.5 V 4.5 V
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