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. 823-4232
Mfr. Part No.PCA9535EDWR2G
HK$20.486
Each (In a Pack of 10)
units
16 I2C 24 SOIC 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 190-0530
Mfr. Part No.MAX7313ATG+
HK$36.635
Each (In a Pack of 2)
units
16 Serial I2C 24 TQFN 400kHz Surface Mount 3.6 V 2 V
RS Stock No. 168-5139
Mfr. Part No.PCF8574PW
HK$13.629
Each (In a Tube of 70)
units
- I2C 20 TSSOP - Surface Mount - -
RS Stock No. 165-2077
Mfr. Part No.MCP23008-E/ML
BrandMicrochip
HK$8.604
Each (In a Tube of 91)
units
8 I2C 20 QFN 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 732-1064
Mfr. Part No.PCF8574ADGVR
HK$15.456
Each (On a Tape of 5)
units
8 I2C 20 TVSOP 100kHz Surface Mount 6 V 2.5 V
RS Stock No. 770-9726
Mfr. Part No.MCP23018-E/MJ
BrandMicrochip
HK$14.10
Each (In a Pack of 3)
units
16 I2C 24 QFN 3.4MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 823-4226
Mfr. Part No.PCA9535ECDWR2G
HK$20.486
Each (In a Pack of 10)
units
16 I2C 24 SOIC 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 681-1128
Mfr. Part No.MCP23017-E/SS
BrandMicrochip
HK$11.865
Each (In a Pack of 2)
units
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS Stock No. 163-0308
Mfr. Part No.PCA9535EDWR2G
HK$8.642
Each (On a Reel of 1000)
units
16 I2C 24 SOIC 1MHz Surface Mount 5.5 V 1.65 V
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. 165-2102
Mfr. Part No.MCP23S17-E/ML
BrandMicrochip
HK$11.708
Each (In a Tube of 61)
units
16 Serial-SPI 28 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 770-9707
Mfr. Part No.MCP23008-E/SS
BrandMicrochip
HK$10.29
Each (In a Pack of 5)
units
8 I2C 20 SSOP 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 189-7058
Mfr. Part No.MAX7317ATE+
HK$21.447
Each (In a Tube of 100)
units
10 Serial-SPI 16 TQFN 26MHz Surface Mount 3.6 V 2.25 V
RS Stock No. 168-5035
Mfr. Part No.TCA9554DBQR
HK$5.292
Each (On a Reel of 2500)
units
8 I2C, Parallel 16 SSOP 100 (Standard) kHz, 400 (Fast) kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 145-8960
Mfr. Part No.MCP23018-E/SP
BrandMicrochip
HK$14.91
Each (In a Tube of 15)
units
16 I2C 28 SPDIP 3.4MHz Through Hole - -
RS Stock No. 124-2356
Mfr. Part No.PCA9555PW,112
BrandNXP
HK$13.839
Each (In a Tube of 63)
units
16 I2C, SMBus 24 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 177-2849
Mfr. Part No.MCP23S08T-E/SO
BrandMicrochip
HK$8.316
Each (On a Reel of 1100)
units
8 SPI 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 436-8344
Mfr. Part No.PCF8575TS/1,112
BrandNXP
HK$19.32
Each
units
16 I2C 24 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS Stock No. 160-3384
Mfr. Part No.ADP5588ACPZ-R7
HK$16.584
Each (On a Reel of 1500)
units
18 I2C 24 LFCSP WQ 400kHz Surface Mount 3 V 1.7 V