In the world of embedded electronics like Arduino the I2C/Wire protocol if often used to access different devices. Below is a list of the most frequently used I2C addresses used found in Arduino code and examples. Please note that some devices also have the possibility to use number of different addresses.
| Typical I2C address [hex] | Device | Device type | Typical use | Address range [hex] |
|---|---|---|---|---|
| 20 | MCP23008 | 8-bit remote bidirectional I/O port | I/O expander | 20-27 |
| 20 | MCP23017 | 16-bit remote bidirectional I/O port | I/O expander | 20-27 |
| 27 | PCF8574 | 8-bit remote bidirectional I/O port | LCD I2C adapter | 20-27 |
| 27 | PCF8574T | 8-bit remote bidirectional I/O port | LCD I2C adapter | 20-27 |
| 3F | SX1508 | 8-bit remote bidirectional I/O port | I/O expander | 20-23 |
| 3F | SX1507 | 4-bit remote bidirectional I/O port | I/O expander | 3E-3F, 70-71 |
| 3E | SX1509 | 16-bit remote bidirectional I/O port | I/O expander | 3E-3F, 70-71 |
| 3F | PCF8574A | 8-bit remote bidirectional I/O port | LCD I2C adapter | 38-3F |
| 50 | 24AA08 | EEPROM 1 kB | EEPROM 1 kB | 50-57 no difference |
| 50 | 24FC128 | EEPROM 16 kB | EEPROM 16 kB | 50-57 |
| 50 | 24LC08B | EEPROM 1 kB | EEPROM 1 kB | 50-57 no difference |
| 50 | 24LC64 | EEPROM 8 kB | EEPROM 8 kB | 50-57 |
| 50 | 24LC1025 | EEPROM 128 kB | EEPROM 128 kB | 50-57 |
| 50 | AT24C16 | EEPROM 2 kB | EEPROM 2 kB | 50-57 |
| 50 | AT24C256 | EEPROM 32 kB | EEPROM 32 kB | 50-57 |
| 50 | M24128 | EEPROM 16 kB | EEPROM 16 kB | 50-57 |
| 50 | M24C32 | EEPROM 4 kB | EEPROM 4 kB | 50-57 |
| 60 | Si5351A | Clock Generator | Clock or RF generator | - |
| 70 | TCA9548A | 1:8 I2C multiplexer | I2C multiplexer | 70-77 |