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. 770-9726
Mfr. Part No.MCP23018-E/MJ
BrandMicrochip
HK$12.85
Each (In a Pack of 3)
units
16 I2C 24 QFN 3.4MHz Surface Mount 5.5 V 1.8 V
New
RS Stock No. 190-7057
Mfr. Part No.MAX7321ATE+
HK$20.364
Each (In a Pack of 5)
units
- - - - - - - -
RS Stock No. 162-8708
Mfr. Part No.TCA6416ARTWR
HK$5.461
Each (On a Reel of 3000)
units
16 I2C, Serial 24 WQFN 400kHz Surface Mount 5.5 V 1.65 V
RS Stock No. 168-5035
Mfr. Part No.TCA9554DBQR
HK$4.687
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. 823-4220
Mfr. Part No.PCA9535ECMTTXG
HK$14.97
Each (In a Pack of 10)
units
16 I2C 24 QFN 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 190-6114
Mfr. Part No.MAX7318AUG+
HK$30.953
Each (In a Tube of 62)
units
16 Serial-I2C (2-Wire) 24 TSSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 403-812
Mfr. Part No.MCP23S08-E/SO
BrandMicrochip
HK$9.75
Each (In a Pack of 5)
units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 177-2849
Mfr. Part No.MCP23S08T-E/SO
BrandMicrochip
HK$8.208
Each (On a Reel of 1100)
units
8 SPI 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 517-0261
Mfr. Part No.PCF8574APW
HK$13.09
Each
units
- - 20 TSSOP - Surface Mount - -
RS Stock No. 191-4975
Mfr. Part No.MAX7315AUE+
HK$24.328
Each (In a Pack of 5)
units
8 Serial-2 Wire 16 TSSOP 400kHz Surface Mount 3.6 V 2 V
New
RS Stock No. 190-6927
Mfr. Part No.MAX7310AUE+
HK$32.702
Each (In a Pack of 5)
units
- - - - - - - -
RS Stock No. 799-3160
Mfr. Part No.MAX7312AAG+
HK$36.90
Each (In a Pack of 2)
units
16 Serial-2 Wire 24 SSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 823-4236
Mfr. Part No.PCA9535EMTTXG
HK$14.97
Each (In a Pack of 10)
units
16 I2C 24 QFN 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 121-7978
Mfr. Part No.PCA9535ECDTR2G
HK$8.09
Each (On a Reel of 2500)
units
16 I2C 24 TSSOP 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 145-6846
Mfr. Part No.PCA9534ADB
HK$9.271
Each (In a Tube of 80)
units
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 809-9812
Mfr. Part No.ADP5588ACPZ-R7
HK$23.62
Each (In a Pack of 2)
units
18 I2C 24 LFCSP WQ 400kHz Surface Mount 3 V 1.7 V
RS Stock No. 770-9729
Mfr. Part No.MCP23018-E/SS
BrandMicrochip
HK$14.20
Each (In a Pack of 3)
units
16 I2C 24 SSOP 3.4MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 861-0595
Mfr. Part No.MTCH652-I/SS
BrandMicrochip
HK$12.87
Each (In a Pack of 5)
units
19 Serial-SPI 28 SSOP 2MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 819-5575
Mfr. Part No.MCP23S17T-E/SS
BrandMicrochip
HK$8.56
Each (On a Reel of 2100)
units
16 Serial-SPI 28 SSOP 10MHz Surface Mount 5.5 V 4.5 V
RS Stock No. 192-1858
Mfr. Part No.MAX7315ATE+
HK$16.037
Each (In a Tube of 100)
units
8 Serial-2 Wire 16 QFN 400kHz Surface Mount 3.6 V 2 V
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