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. 825-3233
Mfr. Part No.PCA9534ADB
$2.55
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 403-894
Mfr. Part No.MCP23S17-E/SO
BrandMicrochip
$1.99
Each (In a Pack of 5)
units
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS Stock No. 669-6452
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
$2.23
Each (In a Pack of 5)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 273-539
Mfr. Part No.P82B715TD,112
BrandNXP
$5.83
Each
units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - -
RS Stock No. 162-6807
Mfr. Part No.XIO2001IZGU
$7.20
Each (In a Tray of 160)
units
16 Serial-2 Wire 169 BGA 66MHz Surface Mount 3.6 V 3 V
RS Stock No. 825-3274
Mfr. Part No.PCA9557D
$2.77
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 681-1143
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
$2.67
Each (In a Pack of 2)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS Stock No. 796-8495
Mfr. Part No.XIO2001IZGU
$10.85
Each
units
16 Serial-2 Wire 169 BGA 66MHz Surface Mount 3.6 V 3 V
RS Stock No. 887-7319
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
$1.68
Each (In a Tube of 47)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 145-6846
Mfr. Part No.PCA9534ADB
$1.689
Each (In a Tube of 80)
units
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 812-2666
Mfr. Part No.PCA9534PW
$4.30
Each
units
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 165-4811
Mfr. Part No.MCP23016-I/SP
BrandMicrochip
$2.42
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 400MHz Through Hole - -
RS Stock No. 162-7823
Mfr. Part No.PCA9534PW
$2.811
Each (In a Tube of 90)
units
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 188-5383
Mfr. Part No.CY8C9540A-24PVXI
$11.40
Each (In a Tube of 30)
units
40 I2C 48 SSOP 24MHz Surface Mount 5.25 V 3 V
RS Stock No. 159-7514
Mfr. Part No.MTCH652-I/SS
BrandMicrochip
$2.32
Each (In a Tube of 47)
units
19 Serial-SPI 28 SSOP 2MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 517-0700
Mfr. Part No.PCF8574PW
$2.818
Each (In a Pack of 5)
units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 861-0595
Mfr. Part No.MTCH652-I/SS
BrandMicrochip
$2.28
Each (In a Pack of 5)
units
19 Serial-SPI 28 SSOP 2MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 162-8358
Mfr. Part No.TCA9554APWR
$1.165
Each (On a Reel of 2000)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 661-3380
Mfr. Part No.PCF8574PWR
$2.75
Each (In a Pack of 5)
units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 145-6521
Mfr. Part No.PCF8574APW
$2.00
Each (In a Tube of 70)
units
- - 20 TSSOP - Surface Mount - -
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