MAX5429EUA

Overview

The MAX5429EUA is a one-time programmable, linear-taper digital potentiometer featuring a 10kΩ end-to-end resistance. It provides 32 wiper positions accessible via a simple 2-wire serial interface (CS and U/D). The device operates on a single supply voltage ranging from 2.7V to 5.5V with a maximum static supply current of 1.5µA. It includes an optional one-time programmable feature that allows the user to define the power-on reset position or lock the wiper position permanently. The component is housed in an 8-pin µMAX package and is guaranteed to operate over an extended temperature range of -40°C to +85°C.

Feature Summary

• One-time programmable wiper position storage and optional interface lockout
• 32 tap positions with 10kΩ end-to-end resistance
• Ultra-low 1.5µA (max) static supply current
• Simple 2-wire serial interface for wiper adjustment

Applications

• Mechanical potentiometer replacement
• Products requiring one-time factory calibration
• Fixed resistor-divider applications after lock-bit programming

Procurement Notes

Verify the specific ordering suffix 'EUA' corresponds to the 8-pin µMAX package and the -40°C to +85°C temperature range. Confirm that the device matches the MAX5429 variant with 10kΩ resistance. Ensure compatibility with the required 2-wire serial interface timing specifications during integration.

Selection Notes

Select the MAX5429EUA when a 10kΩ resistance value is required. Choose this model over the MAX5427 (100kΩ) or MAX5428 (50kΩ) based on circuit impedance needs. The µMAX package is suitable for space-constrained designs. Consider the one-time programming capability if a fixed initial power-on state or permanent lockout is necessary for the application.

Part Context

The MAX5429EUA belongs to the MAX5427/MAX5428/MAX5429 family of one-time programmable, linear-taper digital potentiometers. These devices replace mechanical potentiometers using a digital interface. The family shares identical features regarding resolution, supply voltage, and interface logic, differing primarily in their end-to-end resistance values: 100kΩ for MAX5427, 50kΩ for MAX5428, and 10kΩ for MAX5429.

Replacement Considerations

Direct functional replacements within the same family include the MAX5427EUA (100kΩ) and MAX5428EUA (50kΩ), provided the resistance value difference is acceptable for the circuit design. Other packages such as the Thin QFN-EP (ETA suffix) are pin-compatible alternatives.