MAX5428EUA+T

Overview

The MAX5428EUA+T is a single-channel, linear-taper digital potentiometer with an end-to-end resistance of 50kΩ. It features 32 tap positions and operates on a single supply voltage ranging from 2.7V to 5.5V. The device utilizes a simple 2-wire serial interface (CS and U/D) 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 serial interface. It draws a maximum static supply current of 1.5µA and is available in an 8-pin µMAX package.

Feature Summary

• One-Time Programmable (OTP) capability for user-defined power-on reset position or permanent interface lockout
• 32 tap positions with linear taper and 50kΩ nominal end-to-end resistance
• Ultra-low static supply current of 1.5µA (max)
• Simple 2-wire serial interface (Chip Select and Up/Down)

Applications

• Mechanical potentiometer replacement in space-constrained designs
• Products requiring factory calibration settings that must persist after power cycles
• Battery-powered systems requiring minimal quiescent current

Procurement Notes

Verify the specific ordering suffix to confirm the package type; 'EUA' denotes the 8-pin µMAX package, while 'ETA' indicates the Thin QFN-EP variant. Confirm RoHS compliance status as indicated in the manufacturer's documentation. Ensure the design accounts for the VPP programming voltage requirements if OTP functionality is utilized.

Selection Notes

Select the MAX5428EUA+T when a 50kΩ resistance value is required. Compare against MAX5427 (100kΩ) and MAX5429 (10kΩ) for different resistance needs. Choose this component over volatile digital potentiometers if non-volatile power-on reset behavior or fixed-resistor lockout modes are necessary for the application.

Part Context

This component belongs to the MAX5427/MAX5428/MAX5429 family of one-time programmable, linear-taper digital potentiometers. These devices share identical functional block diagrams and interface protocols, differing primarily in their end-to-end resistance values (100kΩ, 50kΩ, and 10kΩ respectively). They are designed to replace mechanical potentiometers in applications where size, reliability, and programmability are critical.

Replacement Considerations

Direct pin-compatible replacements within the same family include MAX5427EUA+T (100kΩ) and MAX5429EUA+T (10kΩ), provided the resistance value matches the circuit requirements. Other series may require schematic redesign due to differences in interface protocols or voltage ranges.