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. 812-2666
Mfr. Part No.PCA9534PW
PHP87.65
Each
units
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 168-5035
Mfr. Part No.TCA9554DBQR
PHP38.275
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. 177-3187
Mfr. Part No.MCP23008T-E/SO
BrandMicrochip
PHP53.69
Each (In a Pack of 10)
units
8 I2C 18 SOIC 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 166-0319
Mfr. Part No.PCA9539BS,118
BrandNXP
PHP46.859
Each (On a Reel of 6000)
units
- I2C, SMBus - HVQFN - Surface Mount - -
RS Stock No. 190-7042
Mfr. Part No.MAX7300AAI+
PHP285.425
Each (In a Pack of 2)
units
- Serial I2C - SSOP - Surface Mount 5.5 V 2.5 V
RS Stock No. 190-6115
Mfr. Part No.MAX7321ATE+
PHP83.998
Each (In a Tube of 100)
units
8 Serial I2C 16 TQFN 400kHz Surface Mount 5.5 V 1.71 V
RS Stock No. 177-2850
Mfr. Part No.MCP23S08T-E/SS
BrandMicrochip
PHP45.818
Each (On a Reel of 1600)
units
8 SPI 20 SSOP 10MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 920-3371
Mfr. Part No.PCF8574ADW
PHP63.243
Each (In a Tube of 40)
units
- I2C 16 SOIC - Surface Mount - -
RS Stock No. 191-3756
Mfr. Part No.DS2482S-800+T&R
PHP358.08
Each
units
8 I2C 16 SO 400kHz Surface Mount 5.5 V 4.5 V
RS Stock No. 193-8488
Mfr. Part No.CY8C9560A-24AXI
PHP336.855
Each (In a Tray of 90)
units
60 I2C 100 TQFP 100kHz Surface Mount 5.25 V 3 V
RS Stock No. 669-6461
Mfr. Part No.MCP23S18-E/SO
BrandMicrochip
PHP85.68
Each (In a Pack of 2)
units
16 SPI 28 SOIC 10MHz Surface Mount - -
RS Stock No. 815-0683
Mfr. Part No.PCA9554DB,112
BrandNXP
PHP76.783
Each (In a Pack of 6)
units
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 669-6452
Mfr. Part No.MCP23S17-E/SS
BrandMicrochip
PHP69.30
Each (In a Pack of 5)
units
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS Stock No. 517-0671
Mfr. Part No.PCF8574DW
PHP84.036
Each (In a Pack of 5)
units
- I2C 16 SOIC - Surface Mount - -
RS Stock No. 770-9704
Mfr. Part No.MCP23008-E/ML
BrandMicrochip
PHP52.302
Each (In a Pack of 5)
units
8 I2C 20 QFN 1.7MHz Surface Mount 5.5 V 1.8 V
RS Stock No. 133-0706
Mfr. Part No.TCA9538DBR
PHP72.98
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. 823-4226
Mfr. Part No.PCA9535ECDWR2G
PHP91.88
Each (In a Pack of 10)
units
16 I2C 24 SOIC 1MHz Surface Mount 5.5 V 1.65 V
RS Stock No. 133-0707
Mfr. Part No.TCA9554ADBR
PHP69.30
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. 789-3975
Mfr. Part No.CAT9554YI-GT2
PHP79.80
Each (On a Tape of 5)
units
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS Stock No. 661-3475
Mfr. Part No.PCF8575CDW
PHP151.018
Each (In a Pack of 5)
units
- I2C, SMBus 24 SOIC - Surface Mount - -
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