MAX5423ETA+

Overview

The MAX5423ETA+ is a single-channel, nonvolatile digital potentiometer featuring 256 taps and an SPI-compatible serial interface. It operates within a supply voltage range of 2.7V to 5.25V with a typical operating current of 1µA. The device incorporates EEPROM technology to store wiper position data, ensuring retention upon power-up or via interface command. It utilizes a compact 3mm x 3mm x 0.8mm TDFN surface-mount package and exhibits a temperature coefficient of 35ppm/°C.

Feature Summary

• Nonvolatile wiper position storage using EEPROM for data retention across power cycles
• Compact 3mm x 3mm x 0.8mm TDFN surface-mount packaging
• SPI-compatible three-wire serial interface for control and status communication
• Low operating supply current suitable for battery-powered applications

Applications

• Calibration systems requiring persistent adjustment values
• Programmable gain amplifier biasing circuits
• Consumer electronics with infrequent configuration changes
• Industrial instrumentation needing stable resistance settings

Procurement Notes

Verify the specific suffix 'ETA+' indicates lead-free compliance and RoHS adherence as per manufacturer standards. Confirm the TDFN-8 package dimensions match PCB footprint requirements. Ensure the SPI interface timing parameters align with the host microcontroller's clock speeds. Validate that the 2.7V minimum supply voltage meets system rail specifications under all operating conditions.

Selection Notes

Select this component when nonvolatile memory is required to maintain resistance settings without external backup batteries. The 256-tap resolution offers finer adjustment granularity compared to lower-tap alternatives. The low quiescent current makes it suitable for energy-constrained designs. Verify that the serial interface protocol matches the system controller capabilities before integration.

Part Context

This part belongs to the MAX542x family of nonvolatile digital potentiometers from Analog Devices/Maxim Integrated. It provides a solid-state alternative to mechanical potentiometers in applications where physical wear or space constraints are concerns. The series emphasizes reliability through integrated EEPROM storage, eliminating the need for volatile memory support circuitry.

Replacement Considerations

Cross-reference with other MAX542x variants for pin compatibility. Verify if higher tap counts or different resistance values are needed. Check package availability for direct board replacement. Ensure interface compatibility remains consistent with existing firmware drivers.