MAX5428ETA

Overview

The MAX5428ETA is a single-channel digital potentiometer IC featuring 32 taps and one-time programmable (OTP) non-volatile memory. It operates within a supply voltage range of 2.7V to 5.5V with a typical operating current of 1.5µA. The device utilizes a linear taper and offers a serial 2-wire interface for control. Packaged in an 8-lead TDFN with an exposed pad, it supports surface-mount installation and functions across an industrial temperature range from -40°C to +85°C.

Feature Summary

• 32-tap resolution with one-time programmable non-volatile storage
• Serial 2-wire digital interface for simplified connectivity
• Low power consumption with 1.5µA operating current
• Linear taper characteristic for precise resistance adjustment

Applications

• Battery-powered portable equipment requiring low standby current
• Industrial systems needing calibrated analog signal conditioning
• Consumer electronics utilizing space-saving surface-mount packages

Procurement Notes

Verify component authenticity through authorized distribution channels due to the presence of obsolete status indicators in some listings. Confirm package integrity upon receipt as the TDFN-8 EP format requires specific handling during assembly. Cross-reference datasheet revisions to ensure compatibility with existing design specifications before finalizing procurement orders.

Selection Notes

Select this component when a compact solution with permanent resistance settings is required. The 2-wire interface reduces pin count compared to SPI variants. Ensure the 50kΩ resistance value aligns with circuit impedance requirements. Verify that the OTP nature of the memory meets the design's calibration permanence needs without requiring reprogramming capabilities.

Part Context

This part belongs to the MAX5428 series of digital potentiometers designed for applications where traditional mechanical pots are impractical. It integrates the resistive element and control logic into a small footprint. The series emphasizes reliability and low power, targeting industries such as automotive and industrial automation where size and durability are critical constraints.

Replacement Considerations

Check for direct substitutes within the MAX542x family if pinout compatibility is essential. Evaluate MAX5429 or similar variants if higher tap counts or different interfaces like SPI are acceptable. Verify that any replacement maintains the same voltage range and thermal characteristics to avoid redesigning the power and thermal management sections.