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. 825-3246
Mfr. Part No.PCA9534DW
$3.09
Each (In a Pack of 5)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 190-6115
Mfr. Part No.MAX7321ATE+
$2.547
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. 823-4232
Mfr. Part No.PCA9535EDWR2G
$2.68
Each (In a Pack of 10)
units
16 I2C 24 SOIC 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 770-9701
Mfr. Part No.MCP23009-E/MG
BrandMicrochip
$1.85
Each (In a Pack of 5)
units
8 I2C 16 QFN 3.4MHz Surface Mount 5.5 V 1.8 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. 177-2852
Mfr. Part No.MCP23S17T-E/SO
BrandMicrochip
$1.45
Each (On a Reel of 1600)
units
16 SPI 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
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
RS Stock No. 190-7057
Mfr. Part No.MAX7321ATE+
$3.802
Each (In a Pack of 5)
units
- - - - - - - -
RS Stock No. 165-2102
Mfr. Part No.MCP23S17-E/ML
BrandMicrochip
$1.93
Each (In a Tube of 61)
units
16 Serial-SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 168-5033
Mfr. Part No.TCA9538DBR
$1.224
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. 162-5477
Mfr. Part No.PCA9557PWR
$2.013
Each (On a Reel of 2000)
units
- - 16 TSSOP - Surface Mount - -
RS Stock No. 190-7090
Mfr. Part No.MAX7300ATL+
$15.68
Each
units
- - - - - - - -
RS Stock No. 190-6109
Mfr. Part No.MAX7310AUE+
$5.095
Each (In a Tube of 96)
units
8 Serial-I2C (2-Wire) 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 103-5692
Mfr. Part No.PCA9554PW,112
BrandNXP
$2.23
Each (In a Tube of 96)
units
- - 16 TSSOP - Surface Mount - -
RS Stock No. 922-3356
Mfr. Part No.PCF8575CDW
$5.965
Each (In a Tube of 25)
units
- - - - - - - -
RS Stock No. 823-4236
Mfr. Part No.PCA9535EMTTXG
$2.68
Each (In a Pack of 10)
units
16 I2C 24 QFN 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 823-4223
Mfr. Part No.PCA9535ECDTR2G
$2.68
Each (In a Pack of 10)
units
16 I2C 24 TSSOP 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 190-6927
Mfr. Part No.MAX7310AUE+
$6.768
Each (In a Pack of 5)
units
- - - - - - - -
RS Stock No. 189-7055
Mfr. Part No.MAX7313ATG+
$5.11
Each (In a Tube of 75)
units
16 Serial-2 Wire 24 TQFN 400kHz Surface Mount 3.6 V 2 V
RS Stock No. 770-9735
Mfr. Part No.MCP23S17-E/ML
BrandMicrochip
$2.55
Each (In a Pack of 3)
units
16 Serial-SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
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