MAX5418META+T

Overview

The MAX5418META+T is a nonvolatile, linear-taper digital potentiometer featuring a 100kΩ end-to-end resistance and 256 tap positions. It utilizes a fast-mode I²C-compatible serial interface for communication at data rates up to 400kbps. The device includes an internal EEPROM that stores the wiper position for initialization during power-up. Operating on a single supply voltage ranging from +2.7V to +5.25V, it exhibits a typical static supply current of 500nA. The component is housed in a compact 3mm x 3mm 8-pin TDFN package with an exposed pad and is specified over an extended temperature range of -40°C to +85°C.

Feature Summary

• Nonvolatile memory retains wiper position upon power-up
• Fast-mode I²C-compatible serial interface supporting 400kbps
• Linear taper with 100kΩ nominal resistance and 256 taps
• Low standby current of 500nA (typical)

Applications

• Mechanical potentiometer replacement
• Low-drift programmable-gain amplifiers
• Liquid-crystal display (LCD) contrast control

Procurement Notes

Verify the specific factory-preset I²C address associated with the 'M' suffix against system bus requirements. Confirm that the 3mm x 3mm TDFN-EP package footprint matches the PCB land pattern design. Ensure the selected I²C pull-up resistors are appropriate for the bus capacitance and operating voltage levels within the -40°C to +85°C range.

Selection Notes

Select this model for applications requiring a 100kΩ variable resistor with digital control. The 100kΩ value offers higher impedance than the 50kΩ variant but lower than the 200kΩ option. Verify that the maximum continuous current into the H, L, and W terminals does not exceed ±0.6mA. Ensure the I²C master can handle the 12ms busy time required for nonvolatile register writes.

Part Context

This component belongs to the MAX541x series of 256-tap nonvolatile digital potentiometers. It shares the same interface and package as the MAX5417 (50kΩ) and MAX5419 (200kΩ). The 'M' suffix indicates a specific factory-programmed I²C slave address combination, distinct from 'L', 'N', or 'P' suffixes which provide different base addresses.

Replacement Considerations

Direct functional substitutes include MAX5417META+ and MAX5419META+, provided the resistance value difference (50kΩ or 200kΩ) is acceptable for the circuit design. Other MAX541x variants with different address suffixes may be used if the I²C address conflict is resolved via hardware configuration.