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. 189-7055
Mfr. Part No.MAX7313ATG+
HK$31.542
Each (In a Tube of 75)
units
16 Serial-2 Wire 24 TQFN 400kHz Surface Mount 3.6 V 2 V
RS Stock No. 121-7979
Mfr. Part No.PCA9535EMTTXG
HK$9.975
Each (On a Reel of 3000)
units
16 I2C 24 QFN 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 166-0320
Mfr. Part No.PCA9554BS,118
BrandNXP
HK$8.495
Each (On a Reel of 6000)
units
8 I2C, SMBus 16 HVQFN 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 168-5034
Mfr. Part No.TCA9554ADBR
HK$4.77
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. 190-7039
Mfr. Part No.MAX7318AUG+
HK$38.45
Each (In a Pack of 2)
units
- Serial I2C - TSSOP - Surface Mount 5.5 V 2 V
RS Stock No. 146-0139
Mfr. Part No.MCP23S09-E/SO
BrandMicrochip
HK$9.314
Each (In a Tube of 42)
units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 190-6980
Mfr. Part No.MAX7311ATG+
HK$46.63
Each (In a Pack of 2)
units
- - - - - - - -
RS Stock No. 661-3374
Mfr. Part No.PCF8574ADWRG4
HK$16.80
Each (In a Pack of 5)
units
- - 16 SOIC - Surface Mount - -
New
RS Stock No. 209-7660
Mfr. Part No.MCP23008T-E/SS
BrandMicrochip
HK$7.907
Each (On a Reel of 1600)
units
8 I2C, Serial 20 SSOP 1.7MHz - - -
RS Stock No. 133-0706
Mfr. Part No.TCA9538DBR
HK$13.744
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. 770-9723
Mfr. Part No.MCP23S08-E/ML
BrandMicrochip
HK$11.35
Each (In a Pack of 5)
units
8 Serial-SPI 20 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 273-539
Mfr. Part No.P82B715TD,112
BrandNXP
HK$31.00
Each
units
- I2C, SMBus 8 SOIC 400kHz Surface Mount - -
RS Stock No. 189-7059
Mfr. Part No.MAX7318ATG+
HK$34.872
Each (In a Tube of 75)
units
16 Serial-2 Wire 24 QFN 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 687-8770
Mfr. Part No.MCP23S08-E/SS
BrandMicrochip
HK$11.86
Each
units
8 SPI 20 SSOP 10MHz Surface Mount - -
RS Stock No. 103-5691
Mfr. Part No.PCA9554D,112
BrandNXP
HK$9.762
Each (In a Tube of 48)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount - -
RS Stock No. 809-9812
Mfr. Part No.ADP5588ACPZ-R7
HK$24.255
Each (In a Pack of 2)
units
18 I2C 24 LFCSP WQ 400kHz Surface Mount 3 V 1.7 V
RS Stock No. 669-6455
Mfr. Part No.MCP23018-E/SP
BrandMicrochip
HK$14.91
Each (In a Pack of 5)
units
16 I2C 28 SPDIP 3.4MHz Through Hole - -
RS Stock No. 145-1321
Mfr. Part No.PCA9538DW
HK$13.35
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 177-2850
Mfr. Part No.MCP23S08T-E/SS
BrandMicrochip
HK$8.18
Each (On a Reel of 1600)
units
8 SPI 20 SSOP 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 661-3371
Mfr. Part No.PCA9557PWR
HK$12.40
Each (In a Pack of 5)
units
- - 16 TSSOP - Surface Mount - -