MAX5478ETE#G16

Overview

The MAX5478ETE+ is a dual, nonvolatile, linear-taper digital potentiometer featuring 256 tap points per channel and a nominal end-to-end resistance of 50kΩ. It utilizes a fast-mode I²C-compatible serial interface operating up to 400kbps with three address inputs for multi-device bus configurations. The device incorporates an internal EEPROM to store wiper positions for power-on recall and includes write-protect capabilities. Operating on a single supply voltage ranging from +2.7V to +5.25V, it exhibits a maximum static supply current of 1µA. The component is housed in a 16-pin, 3mm x 3mm x 0.8mm TQFN package with an exposed paddle and supports an extended operating temperature range of -40°C to +85°C.

Feature Summary

• Dual-channel architecture with 256 linear tap positions and 50kΩ nominal resistance
• Nonvolatile EEPROM storage for wiper position recall upon power-up
• I²C-compatible 2-wire serial interface supporting data rates up to 400kbps
• Low power consumption with 1µA maximum static supply current
• Hardware write-protect feature via the WP pin to prevent accidental EEPROM overwrites

Applications

• Replacement for mechanical potentiometers in space-constrained designs
• Low-drift programmable-gain amplifier circuit configurations
• Liquid-crystal display (LCD) contrast control circuits
• Volume control applications requiring precise digital adjustment

Procurement Notes

Verify that the ordering suffix corresponds to the specific package variant required. The 'E' designation indicates the 16-pin TQFN package, while 'U' denotes the 14-pin TSSOP option. Confirm RoHS compliance status and lead-free finish requirements against the specific manufacturing lot documentation provided by the supplier or manufacturer.

Selection Notes

Select the MAX5478 specifically when a 50kΩ end-to-end resistance is required; the MAX5477 offers 10kΩ and the MAX5479 provides 100kΩ. Ensure the application environment remains within the specified -40°C to +85°C temperature range. Verify that the system's I²C bus voltage levels are compatible with the VDD supply range of 2.7V to 5.25V and that appropriate pull-up resistors are implemented on the SDA and SCL lines.

Part Context

This component belongs to the MAX5477/MAX5478/MAX5479 family of dual, nonvolatile, I²C-interface digital potentiometers manufactured by Analog Devices / Maxim Integrated. The family shares identical functional characteristics, including resolution, interface protocol, and packaging options, differing primarily in the nominal end-to-end resistance values assigned to each specific model number.

Replacement Considerations

Publicly confirmed substitute part numbers include MAX5477ETE+T and MAX5479ETE+T from the same product family. These alternatives share the same 16-pin TQFN-EP package and electrical interface but differ in nominal resistance values (10kΩ and 100kΩ, respectively). Direct cross-model substitution requires verifying that the resistance change aligns with the circuit design requirements.