MAX5477EUD+T

Overview

The MAX5477EUD+T is a dual, nonvolatile, linear-taper digital potentiometer featuring an I2C-compatible serial interface. It provides 256 tap positions per potentiometer with a nominal end-to-end resistance of 10kΩ. The device operates on a single supply voltage ranging from +2.7V to +5.25V and draws a maximum static supply current of 1µA. It includes internal nonvolatile EEPROM for power-on wiper recall and supports fast-mode communication at data rates up to 400kbps. The component is housed in a 14-pin TSSOP package and functions over an extended temperature range of -40°C to +85°C.

Feature Summary

• Dual-channel architecture with 256 tap positions and 10kΩ nominal resistance
• Nonvolatile EEPROM storage enables power-on recall of wiper position
• I2C-compatible 2-wire serial interface supporting up to 400kbps data rate
• Hardware write-protect feature via WP pin to prevent accidental EEPROM overwrites

Applications

• Low-drift programmable-gain amplifier circuit configurations
• Liquid-crystal display (LCD) contrast control
• Volume control systems
• Mechanical potentiometer replacement

Procurement Notes

Verify the ordering suffix '+T' corresponds to tape-and-reel packaging when sourcing components. Confirm that the 'EUD' designation aligns with the required 14-pin TSSOP package and the '-40°C to +85°C' operating temperature range. Ensure the specific resistance value matches the MAX5477 variant (10kΩ), as other variants in the series offer different resistance values.

Selection Notes

Select the MAX5477EUD+T specifically for applications requiring a 10kΩ end-to-end resistance; the MAX5478 and MAX5479 variants provide 50kΩ and 100kΩ respectively. Consider the 14-pin TSSOP package dimensions if board space constraints preclude the use of the 16-pin TQFN option. Verify that the system's I2C bus voltage levels are compatible with the device's +2.7V to +5.25V supply range.

Part Context

This component belongs to the MAX5477/MAX5478/MAX5479 family of dual, nonvolatile, I2C-interface digital potentiometers. The MAX5477 variant is distinguished by its 10kΩ nominal resistance, whereas the MAX5478 and MAX5479 offer 50kΩ and 100kΩ options. All family members share identical pinouts, interfaces, and nonvolatile memory features, differing primarily in their resistor array values.

Replacement Considerations

Direct functional substitutes within the same package include the MAX5478EUD+T and MAX5479EUD+T, provided the resistance tolerance allows for 50kΩ or 100kΩ values. For alternative packages, the MAX5477ETE+T offers the same electrical characteristics in a 16-pin TQFN format.