Dual 50kΩ digital potentiometer with 256-tap resolution
The MAX5478EUD+T is a dual-channel digital potentiometer with linear taper, 256 taps per channel, and 50kΩ end-to-end resistance.
I²C interface and selectable address
Communication is over the I²C bus, with a selectable address feature that allows multiple MAX5478EUD+T devices to share the same bus. The selectable address is handled through a dedicated pin, giving the designer flexibility to place several pots on a single I²C line without address conflicts. The wiper resistance is typically 325Ω, which matters when the pot is used as a rheostat or in low-impedance divider networks — that series resistance adds to the bottom of the divider ratio and limits the minimum output voltage.
Non-volatile memory — setting survives power loss
The wiper position is stored in non-volatile memory, meaning the potentiometer returns to its last programmed value at power-up. This is the key differentiator from volatile digital pots that reset to mid-scale or zero on each power cycle. For a BOM line where the calibration value must survive a brownout or a field power cycle — think an industrial transmitter that cannot tolerate a recalibration step at every boot — the non-volatile storage eliminates the need for a separate EEPROM or a microcontroller to reload the setting.
Lifecycle and compliance
It is ROHS3 compliant. For a BOM freeze or a new-design qualification, this part does not carry an LTB risk today.