MAX5418LETA+

Overview

The MAX5418LETA+ is a nonvolatile, linear-taper digital potentiometer featuring a 2-wire I²C-compatible serial interface. It provides 256 tap points with a nominal end-to-end resistance of 100kΩ and a temperature coefficient of 35ppm/°C. The device operates on a single supply voltage ranging from +2.7V to +5.25V and includes an internal EEPROM for wiper position recall upon power-up. Packaged in a compact 3mm x 3mm 8-pin TDFN with an exposed pad, it supports fast-mode data rates up to 400kbps and maintains low standby current.

Feature Summary

• Nonvolatile EEPROM storage retains wiper position across power cycles
• I²C-compatible serial interface supporting up to 400kbps communication
• Single-supply operation within a +2.7V to +5.25V range
• Factory-preset address options allowing multiple devices on one bus

Applications

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

Procurement Notes

Verify the specific ordering suffix 'LETA+' corresponds to the required I²C slave address configuration before procurement. Confirm that the 8-pin TDFN-EP package dimensions align with the target PCB land pattern. Ensure the design accommodates the exposed pad connection to ground for optimal thermal performance.

Selection Notes

Select this component when a 100kΩ digital potentiometer is required alongside nonvolatile memory retention. The I²C interface minimizes board space compared to parallel interfaces. Verify that the system logic levels are compatible with the VDD range or utilize appropriate level shifting if interfacing with lower voltage microcontrollers.

Part Context

This part belongs to the MAX5417/MAX5418/MAX5419 family of 256-tap digital potentiometers. The MAX5418 variant specifically offers a 100kΩ resistance value, distinguishing it from the 50kΩ MAX5417 and the 200kΩ MAX5419. All variants share identical pinouts, interfaces, and nonvolatile memory architectures.

Replacement Considerations

Direct functional substitutes within the same family include the MAX5417LETA+ and MAX5419LETA+. These alternatives differ only in their nominal end-to-end resistance values (50kΩ and 200kΩ, respectively). Ensure the new selection matches the circuit's impedance requirements.