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. 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. 517-0700
Mfr. Part No.PCF8574PW
$2.818
Each (In a Pack of 5)
units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 124-2361
Mfr. Part No.PCA9698DGG,512
BrandNXP
$7.08
Each (In a Tube of 35)
units
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 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. 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. 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. 511-068
Mfr. Part No.PCA9698DGG,512
BrandNXP
$8.35
Each
units
40 - 56 TSSOP 1MHz 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. 770-9732
Mfr. Part No.MCP23S09-E/MG
BrandMicrochip
$1.94
Each (In a Pack of 5)
units
8 Serial-SPI 16 QFN 10MHz 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. 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
$2.60
Each
units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 166-0161
Mfr. Part No.PCA9555D,118
BrandNXP
$2.366
Each (On a Reel of 1000)
units
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 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. 146-0139
Mfr. Part No.MCP23S09-E/SO
BrandMicrochip
$1.53
Each (In a Tube of 42)
units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 687-8770
Mfr. Part No.MCP23S08-E/SS
BrandMicrochip
$1.97
Each
units
8 SPI 20 SSOP 10MHz Surface Mount - -
RS Stock No. 510-807
Mfr. Part No.PCA8575BS,118
BrandNXP
$3.08
Each (In a Pack of 5)
units
- - 24 HVQFN - Surface Mount - -
RS Stock No. 770-9713
Mfr. Part No.MCP23016-I/ML
BrandMicrochip
$2.58
Each (In a Pack of 3)
units
16 I2C 28 QFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 103-8077
Mfr. Part No.PCA9554ABS,118
BrandNXP
$1.07
Each (On a Reel of 6000)
units
- - - HVQFN - Surface Mount - -
RS Stock No. 193-8488
Mfr. Part No.CY8C9560A-24AXI
$11.49
Each (In a Tray of 90)
units
60 I2C 100 TQFP 100kHz Surface Mount 5.25 V 3 V
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