MAX5477ETE+

Overview

The MAX5477ETE+ is a dual, nonvolatile, linear-taper digital potentiometer featuring 256 tap positions per channel. It operates on a single supply voltage ranging from +2.7V to +5.25V with a maximum static supply current of 1µA. The device utilizes an internal EEPROM to store wiper positions for power-on recall and includes write protection capabilities. It communicates via a fast-mode I²C-compatible serial interface supporting data rates up to 400kbps. The nominal end-to-end resistance is 10kΩ with a temperature coefficient of 70ppm/°C. The component is housed in a 16-pin Thin Quad Flatpack (TQFN) package measuring 3mm x 3mm x 0.8mm.

Feature Summary

• Dual-channel architecture with 256 discrete tap points per potentiometer
• Nonvolatile EEPROM memory retains wiper position across power cycles
• I²C-compatible serial interface with three address inputs for eight unique combinations
• Low static supply current of 1µA maximum during normal operation

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 digital adjustment

Procurement Notes

Verify the specific ordering suffix ETE+ corresponds to the 16-pin TQFN-EP package and tape-and-reel shipping format. Confirm RoHS compliance status as indicated by the plus sign in the part number. Ensure the selected variant matches the required 10kΩ resistance value, distinct from the 50kΩ or 100kΩ options available in the series.

Selection Notes

Select the MAX5477ETE+ specifically for its 10kΩ end-to-end resistance; other variants in the family offer 50kΩ or 100kΩ. The exposed pad (EP) design requires thermal management considerations due to the junction-to-ambient thermal resistance of 57.2°C/W. Verify that the system bus supports the required 400kbps clock frequency and that pull-up resistors are appropriately sized for the SDA and SCL lines.

Part Context

This component belongs to the MAX5477/MAX5478/MAX5479 family of dual, nonvolatile digital potentiometers. The MAX5477 variant is distinguished by its 10kΩ nominal resistance, whereas the MAX5478 and MAX5479 provide 50kΩ and 100kΩ respectively. All family members share identical pinouts, interfaces, and nonvolatile memory features, differing primarily in resistance values and associated current handling limits.

Replacement Considerations

Direct functional replacements within the same package include the MAX5478ETE+T and MAX5479ETE+T, provided the higher resistance values are acceptable for the application. Note that these substitutes have lower continuous current ratings compared to the MAX5477.