MAX5427EUA+T

Overview

The MAX5427EUA+T is a linear-taper digital potentiometer with an end-to-end resistance of 100kΩ and 32 tap positions. It operates on a single supply voltage ranging from 2.7V to 5.5V, consuming a maximum static supply current of 1.5µA. The device utilizes a simple 2-wire serial interface for wiper adjustment. A key feature is the optional one-time programmable (OTP) function, which allows users to define the power-on reset position or permanently lock the wiper setting by disabling the interface.

Feature Summary

• One-Time Programmable (OTP) capability for user-defined power-on reset positions or permanent interface lockout
• Linear-taper design with 32 discrete tap positions and 100kΩ end-to-end resistance
• Ultra-low static supply current of 1.5µA maximum across the operating temperature range
• Simple 2-wire serial interface (CS and U/D) for sequential wiper control

Applications

• Mechanical potentiometer replacement in embedded systems
• Products requiring factory calibration settings that must persist after power cycles
• Fixed resistor-divider applications where post-programming adjustments are prohibited

Procurement Notes

Verify the component marking against the official datasheet specifications to confirm authenticity. Ensure the ordering suffix matches the required package type, as the MAX5427 series is available in both µMAX and Thin QFN packages. Confirm that the specific revision level aligns with your design requirements before finalizing procurement.

Selection Notes

Select the MAX5427EUA+T when a 100kΩ resistance value is required; alternative models like the MAX5428 (50kΩ) and MAX5429 (10kΩ) offer different resistance ranges within the same family. The 'EUA' suffix indicates the 8-pin µMAX package suitable for surface-mount assembly. Consider the OTP functionality if a fixed, non-adjustable resistance ratio is needed after initial configuration.

Part Context

This component belongs to the MAX5427/MAX5428/MAX5429 family of one-time programmable, linear-taper digital potentiometers. These devices replace mechanical potentiometers using a digital interface while offering unique programmability features not found in standard digital potentiometers. The family shares identical pinouts and operational characteristics, differing primarily in their end-to-end resistance values.

Replacement Considerations

Direct functional replacements include the MAX5428EUA+T (50kΩ) and MAX5429EUA+T (10kΩ), provided the resistance value meets circuit requirements. Other Maxim digital potentiometers may serve as substitutes if OTP functionality is not critical, though pin compatibility and interface protocols must be verified.