MAX5478EUD+T

Overview

The MAX5478EUD+T is a dual, nonvolatile digital potentiometer featuring 256 tap positions per channel and a nominal end-to-end resistance of 50kΩ. It utilizes a fast-mode I²C-compatible serial interface for control. The device operates on a single supply voltage ranging from +2.7V to +5.25V with a maximum static supply current of 1µA. It includes an internal EEPROM to store wiper positions for power-on recall and offers write protection. The component is housed in a 14-pin TSSOP package and functions over an extended temperature range of -40°C to +85°C.

Feature Summary

• Dual-channel architecture with 256 linear-taper tap points per potentiometer
• Nonvolatile EEPROM storage enables power-on recall of wiper position
• I²C-compatible 2-wire serial interface supporting data rates up to 400kbps
• Hardware write-protect feature (WP pin) prevents accidental EEPROM overwrites

Applications

• Mechanical potentiometer replacement in space-constrained designs
• Low-drift programmable-gain amplifier circuit configurations
• Liquid-crystal display (LCD) contrast control circuits
• Volume control applications requiring precise digital adjustment

Procurement Notes

Verify the 'T' suffix confirms tape-and-reel packaging rather than tube packaging. Confirm the 'EUD+' designation corresponds to the 14-pin TSSOP package variant. Ensure the specific revision level matches the design requirements, as datasheet revisions may update timing or electrical characteristics. Cross-reference the manufacturer part number with authorized distributors to ensure authenticity and traceability.

Selection Notes

Select the MAX5478 specifically for its 50kΩ nominal resistance value; choose MAX5477 for 10kΩ or MAX5479 for 100kΩ if different impedance levels are required. The EUD+ suffix indicates the TSSOP-14 package, whereas ETE+ variants use TQFN packages. Ensure the application supports the I²C protocol and that the system voltage remains within the 2.7V to 5.25V operating range to maintain specified linearity and speed performance.

Part Context

This component belongs to the MAX5477/MAX5478/MAX5479 family of dual, nonvolatile digital potentiometers. The family shares identical functional architectures, including the I²C interface and nonvolatile memory structure, differing primarily in nominal resistance values and available package options. The MAX5478 specifically provides the 50kΩ resistance option within this series.

Replacement Considerations

Direct replacements within the same family include MAX5477EUD+ (10kΩ) and MAX5479EUD+ (100kΩ), provided the resistance tolerance aligns with circuit requirements. Other Maxim Integrated digital potentiometers with I²C interfaces may serve as alternatives but require verification of pin compatibility, voltage ranges, and memory specifications.