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庫存編號 144-5723
製造零件編號MCP23017-E/SP
BrandMicrochip
TWD44.80
毎管:15 個
單位
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS庫存編號 403-806
製造零件編號MCP23017-E/SP
BrandMicrochip
TWD44.80
/個 (每包:5個)
單位
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS庫存編號 403-894
製造零件編號MCP23S17-E/SO
BrandMicrochip
TWD46.20
/個 (每包:5個)
單位
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS庫存編號 403-816
製造零件編號MCP23017-E/SO
BrandMicrochip
TWD43.00
/個 (每包:5個)
單位
16 I2C, Serial 28 SOIC 5MHz Surface Mount - -
RS庫存編號 887-7319
製造零件編號MCP23S17-E/SS
BrandMicrochip
TWD40.30
毎管:47 個
單位
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS庫存編號 889-5109
製造零件編號MCP23017-E/SO
BrandMicrochip
TWD36.30
毎管:27 個
單位
16 I2C, Serial 28 SOIC 5MHz Surface Mount - -
RS庫存編號 887-7381
製造零件編號MCP23S17-E/SO
BrandMicrochip
TWD38.20
毎管:27 個
單位
16 Serial-SPI 28 SOIC 5MHz Surface Mount - -
RS庫存編號 669-6452
製造零件編號MCP23S17-E/SS
BrandMicrochip
TWD47.20
/個 (每包:5個)
單位
16 Serial-SPI 28 SSOP 5MHz Surface Mount - -
RS庫存編號 797-4728
製造零件編號PCA9555D,118
BrandNXP
TWD72.00
/個 (每包:2個)
單位
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS庫存編號 510-780
製造零件編號PCF8574T/3,512
BrandNXP
TWD56.60
/個 (每包:5個)
單位
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS庫存編號 124-2364
製造零件編號PCF8574T/3,512
BrandNXP
TWD46.50
毎管:48 個
單位
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS庫存編號 889-5128
製造零件編號MCP23017-E/SS
BrandMicrochip
TWD38.00
毎管:47 個
單位
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS庫存編號 912-6833
製造零件編號MCP23S17-E/SP
BrandMicrochip
TWD47.10
毎管:15 個
單位
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS庫存編號 681-1128
製造零件編號MCP23017-E/SS
BrandMicrochip
TWD48.50
/個 (每包:2個)
單位
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS庫存編號 510-784
製造零件編號PCF8574TS/3,112
BrandNXP
TWD63.00
單位
8 I2C 20 SSOP 100kHz Surface Mount 6 V 2.5 V
RS庫存編號 162-7823
製造零件編號PCA9534PW
TWD238.50
毎管:90 個
單位
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS庫存編號 483-7193
製造零件編號PCA9555D,112
BrandNXP
TWD70.00
單位
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS庫存編號 124-2355
製造零件編號PCA9555D,112
BrandNXP
TWD60.40
毎管:30 個
單位
16 I2C, SMBus 24 SOIC 400kHz Surface Mount 5.5 V 2.3 V
RS庫存編號 823-3523
製造零件編號MCP23S17-E/SP
BrandMicrochip
TWD47.10
/個 (每包:10個)
單位
16 SPI 28 PDIP 10MHz Through Hole 5.5 V 1.8 V
RS庫存編號 124-2365
製造零件編號PCF8574TS/3,112
BrandNXP
TWD51.50
毎管:75 個
單位
8 I2C 20 SSOP 100kHz Surface Mount 6 V 2.5 V