MAX5418META+

Overview

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

Feature Summary

• Nonvolatile memory retains wiper position across power cycles
• Fast-mode I²C-compatible serial interface supports up to 400kbps
• Low standby current of 500nA (typical)
• ±0.5 LSB DNL and INL in voltage-divider mode

Applications

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

Procurement Notes

Verify the specific factory-preset address configuration required for the system bus, as the MAX5418META+ corresponds to the 'M' suffix address code. Confirm that the 100kΩ resistance value aligns with the circuit design requirements. Ensure the I²C pullup resistors are selected appropriately for the board capacitance to maintain signal integrity at the maximum clock frequency.

Selection Notes

Select this part when a 100kΩ nominal resistance is needed instead of the 50kΩ (MAX5417) or 200kΩ (MAX5419) variants. The device offers three nominal resistance values within the family. Consider the ±0.5 LSB linearity specifications if precise voltage division is critical. The exposed pad must be connected to a ground plane for optimal thermal performance.

Part Context

This component belongs to the MAX5417/MAX5418/MAX5419 family of 256-tap nonvolatile digital potentiometers. The primary distinction between these models is the end-to-end resistance: 50kΩ for MAX5417, 100kΩ for MAX5418, and 200kΩ for MAX5419. All variants share identical pinouts, interfaces, and nonvolatile memory characteristics.

Replacement Considerations

Direct functional substitutes within the same family include MAX5417META+ (50kΩ) and MAX5419META+ (200kΩ), provided the resistance value difference is acceptable for the application. Other address codes such as MAX5418LETA+, MAX5418NETA+, and MAX5418PETA+ offer different factory presets but maintain the same electrical specifications.

FAQ

How many unique addresses can be configured on the I²C bus?

Each device has four factory-preset addresses determined by the suffix (L, M, N, P). By connecting the A0 input pin to either GND or VDD, two additional unique addresses are created for each preset, allowing a total of eight unique devices to share the same bus.

What is the data retention period of the nonvolatile memory?

The nonvolatile memory is guaranteed to retain data for 50 years at an ambient temperature of +85°C.

What is the maximum endurance of the nonvolatile memory?

The memory endurance is rated for up to 200,000 wiper store cycles at +25°C and 50,000 cycles at +85°C.