MAX5478ETE+T

Overview

The MAX5478ETE+T is a dual, nonvolatile, linear-taper digital potentiometer featuring an I2C-compatible serial interface. It provides two independent potentiometers, each with 256 tap points and a nominal end-to-end resistance of 50kΩ. 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 internal nonvolatile EEPROM for wiper position recall upon power-up and supports fast-mode communication at data rates up to 400kbps. The component is housed in a 16-pin TQFN-EP package and functions over an extended temperature range of -40°C to +85°C.

Feature Summary

• Dual-channel architecture with 256 discrete tap positions per potentiometer
• Nonvolatile EEPROM storage retains wiper settings during power loss
• I2C-compatible 2-wire serial interface supporting up to 400kbps
• Low power consumption with 1µA maximum static supply current

Applications

• Mechanical potentiometer replacement in embedded systems
• Low-drift programmable-gain amplifier circuit configurations
• Liquid-crystal display (LCD) contrast control circuits
• Volume control applications requiring precise resistance adjustment

Procurement Notes

Verify the specific ordering suffix 'T' indicates tape-and-reel packaging when sourcing components. Confirm that the '+T' designation corresponds to lead-free/RoHS-compliant manufacturing standards as specified by Analog Devices/Maxim Integrated. Ensure compatibility with the 16-pin TQFN-EP footprint during procurement planning.

Selection Notes

Select the MAX5478ETE+T specifically for applications requiring a 50kΩ nominal resistance; the MAX5477 offers 10kΩ and the MAX5479 offers 100kΩ. Consider the 3mm x 3mm x 0.8mm TQFN package dimensions for space-constrained designs. Verify that the system requires dual independent channels and nonvolatile memory retention capabilities before finalizing the selection.

Part Context

This component belongs to the MAX5477/MAX5478/MAX5479 family of dual, nonvolatile, I2C-interface digital potentiometers manufactured by Analog Devices/Maxim Integrated. The family shares identical pinouts, interfaces, and functional architectures, differing primarily in the nominal end-to-end resistance values of the resistive arrays.

Replacement Considerations

Direct replacements within the same series include the MAX5477ETE+T (10kΩ) and MAX5479ETE+T (100kΩ), provided the resistance value matches the circuit requirements. Other packages such as the 14-pin TSSOP (e.g., MAX5478EUD+) are electrically compatible but require mechanical adaptation.