MAX5422ETA+T

Overview

The MAX5422ETA+T is a nonvolatile, linear-taper digital potentiometer featuring 256 tap positions and a nominal end-to-end resistance of 50kΩ. It utilizes an internal EEPROM to store wiper position data for initialization during power-up. The device operates on a single supply voltage ranging from +2.7V to +5.25V and communicates via a 3-wire SPI-compatible serial interface with data rates up to 5MHz. Key electrical characteristics include a typical static supply current of 500nA, a ±0.5 LSB DNL/INL in voltage-divider mode, and a 35ppm/°C end-to-end temperature coefficient. It is housed in an 8-pin TDFN package (3mm x 3mm) and specified over an extended temperature range of -40°C to +85°C.

Feature Summary

• Nonvolatile memory retains wiper position upon power-up or interface command
• SPI-compatible serial interface supports clock frequencies up to 5MHz
• Single-supply operation within the +2.7V to +5.25V range
• Low standby supply current of 0.5µA (typical)

Applications

• Mechanical potentiometer replacement
• Low-drift programmable gain amplifier circuits
• Audio volume control
• Liquid-crystal display contrast control

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm the ordering suffix matches the required tape-and-reel packaging format. Ensure compatibility with system voltage levels and SPI timing requirements before integration.

Selection Notes

Select this model specifically for applications requiring a 50kΩ resistance value; other variants offer 100kΩ or 200kΩ options. Verify that the 35ppm/°C end-to-end temperature coefficient meets circuit stability requirements. Ensure the design accommodates the 3mm x 3mm TDFN footprint and exposed pad thermal management.

Part Context

This component belongs to the MAX5422/MAX5423/MAX5424 family of 256-tap nonvolatile digital potentiometers. While sharing identical pinouts, interfaces, and features, the family members are distinguished solely by their nominal end-to-end resistance values: 50kΩ, 100kΩ, and 200kΩ respectively.

Replacement Considerations

Direct functional substitutes within the same series include MAX5423ETA+T (100kΩ) and MAX5424ETA+T (200kΩ), provided the resistance value adjustment is acceptable for the application.