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
New
RS Stock No. 204-3897
Mfr. Part No.MCP23017-E/ML
BrandMicrochip
HK$12.962
Each (In a Pack of 5)
units
16 I2C 28 QFN 1.7MHz Surface Mount - -
RS Stock No. 168-5033
Mfr. Part No.TCA9538DBR
HK$5.576
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. 177-3338
Mfr. Part No.MCP23S08T-E/SO
BrandMicrochip
HK$10.784
Each (In a Pack of 10)
units
8 SPI 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 814-3990
Mfr. Part No.TCA9554APWR
HK$10.689
Each (In a Pack of 10)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 1.65 V
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. 912-6833
Mfr. Part No.MCP23S17-E/SP
BrandMicrochip
HK$12.485
Each (In a Tube of 15)
units
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS Stock No. 177-3101
Mfr. Part No.MCP23S17T-E/SO
BrandMicrochip
HK$11.865
Each (In a Pack of 10)
units
16 SPI 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 177-2852
Mfr. Part No.MCP23S17T-E/SO
BrandMicrochip
HK$8.988
Each (On a Reel of 1600)
units
16 SPI 28 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 162-5477
Mfr. Part No.PCA9557PWR
HK$5.82
Each (On a Reel of 2000)
units
- - 16 TSSOP - Surface Mount - -
RS Stock No. 661-3475
Mfr. Part No.PCF8575CDW
HK$29.274
Each (In a Pack of 5)
units
- I2C, SMBus 24 SOIC - Surface Mount - -
RS Stock No. 823-4223
Mfr. Part No.PCA9535ECDTR2G
HK$20.486
Each (In a Pack of 10)
units
16 I2C 24 TSSOP 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 121-7978
Mfr. Part No.PCA9535ECDTR2G
HK$9.702
Each (On a Reel of 2500)
units
16 I2C 24 TSSOP 1MHz Surface Mount 5.5 V 1.65 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. 190-7042
Mfr. Part No.MAX7300AAI+
HK$50.315
Each (In a Pack of 2)
units
- Serial I2C - SSOP - Surface Mount 5.5 V 2.5 V
RS Stock No. 770-9717
Mfr. Part No.MCP23016-I/SS
BrandMicrochip
HK$15.907
Each (In a Pack of 3)
units
16 I2C 28 SSOP 400kHz Surface Mount 5.5 V 2 V
RS Stock No. 133-0708
Mfr. Part No.TCA9554DBQR
HK$13.03
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. 145-0789
Mfr. Part No.PCA9557D
HK$11.897
Each (In a Tube of 40)
units
8 I2C, SMBus 16 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 861-0595
Mfr. Part No.MTCH652-I/SS
BrandMicrochip
HK$12.112
Each (In a Pack of 5)
units
19 Serial-SPI 28 SSOP 2MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 687-8480
Mfr. Part No.MCP23S09-E/SO
BrandMicrochip
HK$11.32
Each
units
8 SPI 18 SOIC 10MHz Surface Mount - -
RS Stock No. 190-6927
Mfr. Part No.MAX7310AUE+
HK$34.598
Each (In a Pack of 5)
units
- Serial I2C - TSSOP - Surface Mount 5.5 V 2.3 V