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 922-3356
製造零件編號PCF8575CDW
HK$32.018
毎管:25 個
單位
- - - - - - - -
RS庫存編號 661-3374
製造零件編號PCF8574ADWRG4
HK$16.80
/個 (每包:5個)
單位
- - 16 SOIC - Surface Mount - -
RS庫存編號 159-7514
製造零件編號MTCH652-I/SS
BrandMicrochip
HK$11.72
毎管:47 個
單位
19 Serial-SPI 28 SSOP 2MHz Surface Mount 5.5 V 1.8 V
RS庫存編號 681-1128
製造零件編號MCP23017-E/SS
BrandMicrochip
HK$10.24
/個 (每包:2個)
單位
16 I2C 28 SSOP 1.7MHz Surface Mount - -
RS庫存編號 162-8358
製造零件編號TCA9554APWR
HK$6.123
個 (在毎卷:2000)
單位
8 I2C, SMBus 16 TSSOP 400kHz Surface Mount 5.5 V 1.65 V
RS庫存編號 165-2110
製造零件編號MCP23009-E/MG
BrandMicrochip
HK$7.97
毎管:120 個
單位
8 I2C 16 QFN 3.4MHz Surface Mount 5.5 V 1.8 V
RS庫存編號 169-7286
製造零件編號PCA9554DB,112
BrandNXP
HK$8.643
毎管:78 個
單位
8 I2C, SMBus 16 SSOP 400kHz Surface Mount 5.5 V 2.3 V
RS庫存編號 159-7427
製造零件編號MCP23018-E/MJ
BrandMicrochip
HK$10.726
毎管:91 個
單位
16 I2C 24 QFN 3.4MHz Surface Mount 5.5 V 1.8 V
RS庫存編號 770-9717
製造零件編號MCP23016-I/SS
BrandMicrochip
HK$14.46
/個 (每包:3個)
單位
16 I2C 28 SSOP 400kHz Surface Mount 5.5 V 2 V
RS庫存編號 124-1424
製造零件編號FXL6408UMX
HK$2.841
個 (在毎卷:5000)
單位
8 I2C 16 UMLP 400kHz Surface Mount 3.6 V 1.65 V
RS庫存編號 661-3488
製造零件編號PCF8575DW
HK$22.162
/個 (每包:5個)
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16 I2C, SMBus 24 SOIC 400kHz Surface Mount - -
RS庫存編號 188-5383
製造零件編號CY8C9540A-24PVXI
HK$58.02
毎管:30 個
單位
40 I2C 48 SSOP 24MHz Surface Mount 5.25 V 3 V