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. 920-3374
Mfr. Part No.PCF8574AN
$1.82
Each (In a Tube of 25)
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 517-0249
Mfr. Part No.PCF8574AN
$2.20
Each
units
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS Stock No. 920-3371
Mfr. Part No.PCF8574ADW
$2.134
Each (In a Tube of 40)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 517-0233
Mfr. Part No.PCF8574ADW
$2.34
Each
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 661-3387
Mfr. Part No.PCF8574DWR
$2.75
Each (In a Pack of 5)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 178-9133
Mfr. Part No.PCF8574DW
$2.396
Each (In a Tube of 40)
units
- - 16 SOIC - Surface Mount - -
RS Stock No. 517-0671
Mfr. Part No.PCF8574DW
$2.818
Each (In a Pack of 5)
units
- - 16 SOIC - Surface Mount - -
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. 145-0789
Mfr. Part No.PCA9557D
$2.26
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 796-8495
Mfr. Part No.XIO2001IZGU
$9.80
Each
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. 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. 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. 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. 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. 732-1064
Mfr. Part No.PCF8574ADGVR
$2.03
Each (On a Tape of 5)
units
8 I2C 20 TVSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 814-3990
Mfr. Part No.TCA9554APWR
$1.71
Each (In a Pack of 10)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 162-6380
Mfr. Part No.PCF8574ADGVR
$0.87
Each (On a Reel of 2000)
units
8 I2C 20 TVSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 145-6521
Mfr. Part No.PCF8574APW
$2.00
Each (In a Tube of 70)
units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 517-0261
Mfr. Part No.PCF8574APW
$2.34
Each
units
- - 20 TSSOP - Surface Mount - -