MAX5419META+T

Overview

The MAX5419META+T is a nonvolatile, linear-taper digital potentiometer manufactured by Analog Devices (Maxim Integrated). It provides 256 tap positions with a nominal end-to-end resistance of 200kΩ. The device features an internal EEPROM for power-on recall of the wiper position and communicates via a fast-mode I²C-compatible serial interface supporting data rates up to 400kbps. It operates on a single supply voltage ranging from +2.7V to +5.25V. Key electrical characteristics include a 35ppm/°C end-to-end temperature coefficient, ±0.5 LSB DNL and INL in voltage-divider mode, and a typical standby current of 500nA. The component is housed in a compact 3mm x 3mm 8-pin TDFN package with an exposed pad.

Feature Summary

• Nonvolatile Memory: Internal EEPROM stores wiper position for automatic recall upon power-up, ensuring state retention without external memory.
• I²C Interface: Fast-mode compatible 2-wire serial interface allows communication at speeds up to 400kbps, minimizing board space.
• High Precision: Offers ±0.5 LSB Differential Nonlinearity (DNL) and Integral Nonlinearity (INL) in voltage-divider mode with a low 35ppm/°C temperature coefficient.
• Compact Packaging: Available in a tiny 3mm x 3mm 8-pin TDFN package with an exposed ground pad for improved thermal performance.

Applications

• Low-Drift Programmable-Gain Amplifiers
• Liquid-Crystal Display (LCD) Contrast Control
• Mechanical Potentiometer Replacement

Procurement Notes

Verify the specific ordering suffix '+T' against official manufacturer documentation to confirm tape-and-reel packaging status and lead-free/RoHS compliance. Ensure the selected I²C address configuration matches the system requirements, as the 'M' suffix corresponds to a specific factory-programmed address base. Confirm that the 200kΩ resistance value aligns with the circuit's impedance and current handling needs.

Selection Notes

Select the MAX5419 variant specifically when a higher end-to-end resistance of 200kΩ is required, compared to the 50kΩ (MAX5417) or 100kΩ (MAX5418) options. Consider the 200kΩ value for high-impedance signal chains where lower bias currents are critical. Ensure the I²C bus pull-up resistors are appropriately sized for the 400pF maximum capacitive load per line. Verify that the operating voltage range of 2.7V to 5.25V is compatible with the host microcontroller logic levels.

Part Context

The MAX5419 is part of the MAX5417/MAX5418/MAX5419 family of 256-tap, nonvolatile, I²C-interface digital potentiometers. While all three share identical pinouts, interfaces, and nonvolatile memory features, they differ primarily in their nominal end-to-end resistance values. The MAX5419 specifically provides 200kΩ, making it suitable for applications requiring higher resistance ranges than the 50kΩ MAX5417 or 100kΩ MAX5418.

Replacement Considerations

Direct replacements within the same family include MAX5419LETA+, MAX5419NETA+, and MAX5419PETA+, which offer different factory-set I²C addresses but maintain the same 200kΩ resistance and functionality. For systems requiring different resistance values, the MAX5417 (50kΩ) or MAX5418 (100kΩ) may be considered if the circuit impedance allows.