Analog Devices Inc./Maxim Integrated MAX5434NEZT+

Overview

MAX5434NEZT+ from Maxim Integrated is a 32-tap, nonvolatile, I²C-compatible digital potentiometer in a 6-pin thin SOT23 package, configured as a 50kΩ variable resistor with H internally connected to W. It features 5ppm/°C ratiometric temperature coefficient, ±0.15 LSB typical INL/DNL, and operates from +2.7V to +5.25V for precision programmable gain control in low-drift amplifier circuits.

For engineers reviewing the MAX5434NEZT+ datasheet, MAX5434NEZT+ pinout, MAX5434NEZT+ application, or MAX5434NEZT+ equivalent, this page delivers verified electrical specs, I²C timing constraints (400kbps), power-on wiper recall behavior, thermal stability data, and real-world use cases including LCD bias adjustment and programmable filter tuning - all confirmed for the exact MAX5434NEZT+ variant.

Technical Context

The MAX5434NEZT+ implements a 31-element resistor array with fixed 50kΩ end-to-end resistance and internal H–W connection, eliminating external wiring for variable-resistor mode. Its 5-bit wiper register interfaces via I²C using factory-programmed 7-bit slave address 0101010 (binary), requiring no A0 pin configuration.

Nonvolatile EEPROM stores wiper position with 200,000 write cycles and 50-year data retention at +85°C. Power-up initialization transfers NV register contents to volatile register in 20µs, enabling deterministic startup without host intervention.

Key Specifications

Pinout & Package

MAX5434NEZT+ uses a 6-pin thin SOT23 package (PKG CODE Z6-1), 2.30mm × 1.70mm × 0.95mm, with exposed pad not present (unlike TDFN variants). Pin 1 = H/W, Pin 2 = VDD, Pin 3 = SCL, Pin 4 = GND, Pin 5 = SDA, Pin 6 = L.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital potentiometer applications.

Compared with AD5170BRJZ-50-R7 and MCP4017T-E/OT, MAX5434NEZT+ uniquely combines nonvolatile wiper recall, ultra-low 5ppm/°C ratiometric tempco, and guaranteed monotonicity - making it optimal for unattended, temperature-sensitive gain-control applications where power-cycle reliability is mandatory.

Availability

MAX5434NEZT+ is available at Aetrix Electronics and suitable for LCD bias control, programmable filter design, adjustable voltage reference generation, and low-drift programmable-gain amplifier circuits requiring stable component supply across industrial temperature ranges.

Supply support for MAX5434NEZT+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications, emphasizing low-power, high-accuracy performance.

The MAX5432–MAX5435 family was developed specifically for replacing mechanical potentiometers in digitally controlled analog circuits - prioritizing nonvolatile storage, low tempco, and minimal board space in compact SOT23 and TDFN packages.

FAQ

What is the factory-programmed I²C address for MAX5434NEZT+?

The MAX5434NEZT+ has a fixed 7-bit I²C slave address of 0101010 (0x52 in hexadecimal), as specified in the Ordering Information/Selector Guide. This address is factory-programmed and cannot be altered via external pins like A0 - unlike the MAX5432/MAX5433 variants. The device responds only to this address on the I²C bus, ensuring predictable communication without address collision risk in multi-device systems.

Does MAX5434NEZT+ support voltage-divider configuration?

No, MAX5434NEZT+ does not support standard voltage-divider configuration. Per the datasheet's Pin Description and Detailed Description sections, the MAX5434/MAX5435 variants have H internally connected to W, making them dedicated variable-resistor devices with only two accessible terminals (W/H and L). For voltage-divider use with independent H, L, and W access, the MAX5432 or MAX5433 must be selected instead.

How long does nonvolatile memory programming take for MAX5434NEZT+?

Writing to the nonvolatile memory register of MAX5434NEZT+ requires a minimum idle time of 12ms after the STOP condition of the write command, as confirmed in the Timing Characteristics table and Applications Information section. During this period, the device performs internal EEPROM programming and ignores further I²C commands. Host firmware must enforce this delay before issuing subsequent commands to ensure reliable wiper position storage.

What is the maximum capacitive load the wiper output can drive in MAX5434NEZT+?

The MAX5434NEZT+ wiper output is characterized with a maximum external capacitive load of 10pF for specified transient response (e.g., 1.0µs settling time). Driving larger capacitances - such as directly into ADC input sampling capacitors or long PCB traces - degrades bandwidth and increases settling time beyond the 1.0µs typical spec. For loads >10pF, a buffer amplifier is recommended to maintain signal integrity and timing accuracy.

Is the 50kΩ resistance value of MAX5434NEZT+ guaranteed across temperature?

Yes, the 50kΩ end-to-end resistance of MAX5434NEZT+ is specified with a 35ppm/°C end-to-end temperature coefficient over -40°C to +85°C, meaning resistance variation is limited to ±0.295kΩ across the full range. More critically, its 5ppm/°C ratiometric tempco ensures the *ratio* between any two tap positions remains highly stable - essential for gain-setting accuracy where absolute resistance tolerance is secondary to tracking performance.