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
HK$14.644
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
HK$14.794
/個 (每包:5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$12.52
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$13.386
/個 (每包:5個)
單位
8 I2C, Serial 18 PDIP 5MHz Through Hole - -
RS庫存編號 510-780
製造零件編號PCF8574T/3,512
BrandNXP
HK$16.862
/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 517-0249
製造零件編號PCF8574AN
HK$23.62
單位
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS庫存編號 124-2364
製造零件編號PCF8574T/3,512
BrandNXP
HK$15.513
毎管:48 個
單位
8 I2C 16 SOIC 100kHz Surface Mount 5.5 V 2.3 V
RS庫存編號 517-0671
製造零件編號PCF8574DW
HK$23.624
/個 (每包:5個)
單位
- I2C 16 SOIC - Surface Mount - -
RS庫存編號 166-1598
製造零件編號PCA9536DP,118
BrandNXP
HK$9.588
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 920-3374
製造零件編號PCF8574AN
HK$21.73
毎管:25 個
單位
8 I2C, SMBus 16 PDIP 100kHz Through Hole - -
RS庫存編號 922-3338
製造零件編號PCF8574DWR
HK$9.688
個 (在毎卷:2000)
單位
- - - - - - - -
RS庫存編號 178-9133
製造零件編號PCF8574DW
HK$21.734
毎管:40 個
單位
- I2C 16 SOIC - Surface Mount - -
RS庫存編號 510-914
製造零件編號PCA9536DP,118
BrandNXP
HK$12.826
/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 124-2361
製造零件編號PCA9698DGG,512
BrandNXP
HK$53.599
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 511-068
製造零件編號PCA9698DGG,512
BrandNXP
HK$58.26
單位
40 I2C, SMBus 56 TSSOP 1MHz Surface Mount 5.5 V 2.3 V
RS庫存編號 162-7823
製造零件編號PCA9534PW
HK$26.11
毎管:90 個
單位
8 I2C 16 TSSOP 400kHz Surface Mount 5.5 V 2.3 V
RS庫存編號 160-4440
製造零件編號ADP5587ACPZ-R7
HK$19.42
個 (在毎卷:1500)
單位
18 I2C 24 LFCSP WQ 400kHz Surface Mount 3.6 V 1.65 V
RS庫存編號 177-2846
製造零件編號MCP23017T-E/ML
BrandMicrochip
HK$12.626
個 (在毎卷:1600)
單位
16 I2C 28 QFN 10MHz 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$19.693
/個 (每包:3個)
單位
16 I2C 28 SSOP 400kHz Surface Mount 5.5 V 2 V
RS庫存編號 190-6107
製造零件編號MAX7300ATL+
HK$83.867
毎管:50 個
單位
28 Serial I2C 40 TQFN 400kHz Surface Mount 5.5 V 2.5 V