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 403-806
製造零件編號MCP23017-E/SP
BrandMicrochip
HK$10.79
/個 (每包:5個)
單位
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS庫存編號 144-5723
製造零件編號MCP23017-E/SP
BrandMicrochip
HK$12.165
毎管:15 個
單位
16 I2C, Serial 28 SPDIP 5MHz Through Hole - -
RS庫存編號 165-4752
製造零件編號MCP23008-E/P
BrandMicrochip
HK$9.227
毎管:25 個
單位
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS庫存編號 403-563
製造零件編號MCP23008-E/P
BrandMicrochip
HK$9.61
/個 (每包:5個)
單位
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS庫存編號 920-3374
製造零件編號PCF8574AN
HK$12.058
毎管:25 個
單位
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS庫存編號 166-1598
製造零件編號PCA9536DP,118
BrandNXP
HK$4.917
個 (在毎卷:2500)
單位
4 I2C, SMBus 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS庫存編號 510-914
製造零件編號PCA9536DP,118
BrandNXP
HK$9.802
/個 (每包:5個)
單位
4 I2C, SMBus 8 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS庫存編號 517-0249
製造零件編號PCF8574AN
HK$12.34
單位
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS庫存編號 178-9133
製造零件編號PCF8574DW
HK$14.785
毎管:40 個
單位
- I2C 16 SOIC - Surface Mount - -
RS庫存編號 517-0671
製造零件編號PCF8574DW
HK$15.42
/個 (每包:5個)
單位
- I2C 16 SOIC - Surface Mount - -
RS庫存編號 124-2364
製造零件編號PCF8574T/3,512
BrandNXP
HK$12.366
毎管:48 個
單位
8 I2C 16 SOIC 100kHz 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
HK$12.944
/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 511-068
製造零件編號PCA9698DGG,512
BrandNXP
HK$43.54
單位
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS庫存編號 124-2361
製造零件編號PCA9698DGG,512
BrandNXP
HK$42.464
毎管:35 個
單位
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS庫存編號 190-6106
製造零件編號MAX7300AAX+
HK$75.204
毎管:30 個
單位
28 Serial I2C 36 SSOP 400kHz Surface Mount 5.5 V 2.5 V
RS庫存編號 190-6107
製造零件編號MAX7300ATL+
HK$77.94
毎管:50 個
單位
28 Serial I2C 40 TQFN 400kHz Surface Mount 5.5 V 2.5 V
RS庫存編號 770-9723
製造零件編號MCP23S08-E/ML
BrandMicrochip
HK$10.754
/個 (每包:5個)
單位
8 Serial-SPI 20 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS庫存編號 133-0707
製造零件編號TCA9554ADBR
HK$11.104
/個 (每包:5個)
單位
8 I2C, Parallel 16 SSOP 100 (Standard) kHz, 400 (Fast) kHz Surface Mount 5.5 V 1.65 V
RS庫存編號 912-6791
製造零件編號MCP23S09-E/MG
BrandMicrochip
HK$9.725
毎管:120 個
單位
8 Serial-SPI 16 QFN 10MHz Surface Mount 5.5 V 1.8 V
RS庫存編號 687-8770
製造零件編號MCP23S08-E/SS
BrandMicrochip
HK$10.14
單位
8 SPI 20 SSOP 10MHz Surface Mount - -