MAX5432LETA+T

Overview

The MAX5432LETA+T is a single-channel, nonvolatile, linear-taper digital potentiometer featuring 32 tap positions and a nominal end-to-end resistance of 50kΩ. It operates on a single supply voltage ranging from +2.7V to +5.25V with a typical standby current of 0.5µA. The device utilizes a fast-mode I²C-compatible serial interface for communication at data rates up to 400kbps. An internal EEPROM retains the wiper position upon power-up, ensuring immediate recall of the stored setting. The component is housed in an 8-pin TDFN package with an exposed pad and is specified for operation over an extended temperature range of -40°C to +85°C.

Feature Summary

• Nonvolatile memory stores wiper position, enabling power-on recall without external components
• I²C-compatible 2-wire serial interface supports clock frequencies up to 400kHz
• Linear taper with 32 discrete tap points and ±0.15 LSB typical INL/DNL accuracy
• Low static supply current of 500nA (typical) during standby mode

Applications

• Mechanical potentiometer replacement in space-constrained designs
• Low-drift programmable-gain amplifier circuit configurations
• Liquid-crystal display (LCD) screen adjustment and bias control
• Volume control in audio signal paths

Procurement Notes

Verify the specific I²C slave address configuration by checking the logic state of the A0 pin, as this determines the device's address on the bus. Confirm that the 50kΩ resistance value aligns with the system requirements, as other variants in the family offer 100kΩ. Ensure the PCB layout accommodates the 3mm x 3mm TDFN-EP package dimensions and provides adequate thermal relief for the exposed pad if high power dissipation is anticipated.

Selection Notes

Select the MAX5432LETA+T when a 50kΩ resistance value is required alongside nonvolatile storage capabilities. The 'L' suffix indicates a factory-programmed I²C address starting with 010100x, while 'M' denotes 010110x. Verify that the application does not exceed the maximum continuous current limits into the H, L, or W terminals, which are rated at ±1.3mA for this variant. Consider the 35ppm/°C end-to-end temperature coefficient for precision applications requiring stable resistance over temperature variations.

Part Context

This component belongs to the MAX5432–MAX5435 family of 32-tap nonvolatile digital potentiometers manufactured by Analog Devices / Maxim Integrated. The MAX5432 specifically provides a 50kΩ resistor value, whereas the MAX5433 offers 100kΩ. Both share identical pinouts and electrical characteristics except for resistance values. The family replaces mechanical potentiometers using a simple serial interface, suitable for applications requiring digitally adjustable resistance with memory retention.

Replacement Considerations

Public confirmed substitute part numbers: MAX5432META+T (same function, different I²C address), MAX5432LETA (lead-free status may differ based on suffix).

FAQ

How is the I²C address determined for the MAX5432LETA+T?

The first four bits are fixed at 0101. Bits A2 and A1 are factory programmed. For the 'L' suffix, these are 00. The final bit A0 is connected to either GND or VDD, allowing two possible addresses: 0101000 or 0101001.

What is the maximum current allowed into the terminals?

For the MAX5432/MAX5434 (50kΩ devices), the maximum continuous current into terminals H, L, and W is ±1.3mA.

How long does it take to store data in nonvolatile memory?

Writing to the nonvolatile register requires a minimum idle time of 12ms after the STOP condition before another command can be sent.