MAX5478ETE#TG16

Overview

The MAX5478ETE+T is a dual, nonvolatile, linear-taper digital potentiometer featuring 256 tap positions per channel. It utilizes an internal EEPROM to store wiper settings for power-on recall and includes write protection. The device operates on a single supply voltage ranging from +2.7V to +5.25V with a typical static current of 1µA. It communicates via a fast-mode I²C-compatible serial interface supporting data rates up to 400kbps. The nominal end-to-end resistance is 50kΩ with a temperature coefficient of 70ppm/°C. It 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 linear tap points and nonvolatile EEPROM storage
• I²C-compatible serial interface with three address inputs for eight unique combinations
• Low power consumption with 1µA maximum static supply current
• EEPROM write protection feature to prevent accidental data overwrites

Applications

• Mechanical potentiometer replacement in space-constrained designs
• Low-drift programmable-gain amplifier circuit configurations
• Liquid-crystal display (LCD) contrast control systems

Procurement Notes

Verify the ordering suffix '+T' corresponds to tape-and-reel packaging when sourcing components. Confirm that the specific part number matches the 50kΩ resistance variant within the MAX5477/MAX5478/MAX5479 family. Ensure compatibility with the required 16-pin TQFN-EP footprint during procurement planning.

Selection Notes

Select this component for applications requiring precise, nonvolatile resistance adjustment without mechanical wear. The 50kΩ value suits moderate impedance circuits, while the ±1 LSB INL specification ensures accuracy in voltage-divider modes. Consider the exposed paddle thermal characteristics if high power dissipation is anticipated in the design.

Part Context

This component belongs to the MAX5477/MAX5478/MAX5479 series of dual digital potentiometers. The MAX5478 specifically denotes the 50kΩ end-to-end resistance variant, distinguishing it from the 10kΩ MAX5477 and 100kΩ MAX5479 models. All variants share identical pinouts, interfaces, and nonvolatile memory features.

Replacement Considerations

Direct functional replacements include the MAX5477ETE+T and MAX5479ETE+T, which offer identical interfaces and packages but differ in nominal resistance values. Verify that the system impedance requirements align with the 10kΩ or 100kΩ alternatives before substitution.