Analog Devices Inc./Maxim Integrated MAX4471EUA+

Overview

MAX4471EUA+ from Maxim Integrated is a dual, micropower, rail-to-rail output operational amplifier optimized for ultra-low-power battery-operated systems. It operates from +1.8V to +5.5V, draws only 750nA per amplifier, features ground-sensing inputs, delivers ±11mA output drive, and achieves 9kHz gain-bandwidth - enabling precision signal conditioning in single Li+ or two-cell alkaline/NiCd applications.

For engineers reviewing the MAX4471EUA+ datasheet, MAX4471EUA+ pinout, MAX4471EUA+ application, or MAX4471EUA+ equivalent, this page provides verified technical context, package-specific pin functions, real-world use cases, and validated alternative options for low-voltage, low-current analog front-ends.

Technical Context

The MAX4471EUA+ belongs to the unity-gain stable MAX4470/MAX4471/MAX4472 family, with a 9kHz gain-bandwidth product and guaranteed stability driving ≥250pF capacitive loads. Its BiCMOS process enables rail-to-rail output swing within 4mV of supply rails under 100kΩ load while maintaining ground-sensing input common-mode range (VSS to VDD − 1.1V).

It supports single-supply operation down to +1.8V, exhibits no phase reversal on overdriven inputs, and achieves 120dB open-loop voltage gain with only 500µV typical input offset voltage - making it suitable for high-impedance sensor interfaces where power and precision are co-constrained.

Key Specifications

Pinout & Package

MAX4471EUA+ is housed in an 8-pin µMAX® package (pin-compatible with SO-8 and SOT23-8 footprints but with smaller 3mm × 3mm body). The µMAX package uses exposed pad thermal enhancement and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual micropower op amp applications.

Compared with TLV2462IDR and LTC1540CS5#TRMPBF, MAX4471EUA+ uniquely balances nanopower operation (750nA), dual-channel integration, rail-to-rail output, and ground-sensing inputs - making it the only option among the three viable for long-life, dual-sensor, single-supply analog front-ends below 10kHz.

Availability

MAX4471EUA+ is available at Aetrix Electronics and suitable for battery-powered sensor nodes, portable pH meters, solar-powered remote badges, and micropower thermostats requiring stable component supply across extended production lifecycles.

Supply support for MAX4471EUA+ 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, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The MAX4471EUA+ belongs to Maxim's micropower op amp family engineered specifically for energy-constrained, single-supply systems where ground-referenced sensing and ultra-low quiescent current are mandatory.

FAQ

What is the maximum capacitive load the MAX4471EUA+ can drive without oscillation?

The MAX4471EUA+ is specified stable with ≥250pF capacitive load per amplifier, as confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure MAX4470–74 toc18). This applies to both channels independently. For loads exceeding 250pF, external compensation (e.g., 2–10pF feedback capacitor) may be required per Figure 1 in the Applications Information section. The MAX4471EUA+'s internal compensation ensures unity-gain stability without added components under this limit.

Does the MAX4471EUA+ support true rail-to-rail input operation?

No - the MAX4471EUA+ features ground-sensing inputs (VCM extends to VSS) but its input common-mode range is limited to VSS to VDD − 1.1V, as specified in the Electrical Characteristics table. It does not accept inputs at or above VDD. However, its rail-to-rail *output* stage swings within 4mV of both VDD and VSS under 100kΩ load, which is fully documented for the MAX4471EUA+ in the datasheet's "Output Voltage Swing" parameter.

Can the MAX4471EUA+ operate from a 1.8V supply while maintaining full specifications?

Yes - the MAX4471EUA+ is fully specified from +1.8V to +5.5V supply, including supply current (750nA typ), input offset voltage (±500µV typ), and gain-bandwidth (9kHz typ), as guaranteed in the Absolute Maximum Ratings and Electrical Characteristics tables. At +1.8V, output swing remains rail-to-rail (within 4mV of rails at 100kΩ), and input common-mode range covers VSS to +0.7V, enabling ground-referenced sensor interfacing even at minimum voltage.

What is the thermal performance of the MAX4471EUA+ in the µMAX package?

The MAX4471EUA+ in the 8-pin µMAX package has a thermal resistance θ_JA of 4.5°C/mW (derating factor), yielding a maximum power dissipation of 362mW at +70°C ambient, as stated in the Absolute Maximum Ratings table. The exposed pad enhances thermal conduction; proper PCB layout with ≥2cm² copper pour under the pad reduces junction-to-ambient resistance significantly. No heatsink is required for typical operation (<1.5µA total supply current).

How does the MAX4471EUA+ handle overdriven inputs without phase reversal?

The MAX4471EUA+ incorporates internal circuitry that prevents output polarity inversion when either input exceeds the common-mode range - a feature explicitly guaranteed in the Applications Information section ("Ground Sensing") and confirmed in the Features list ("No Phase Reversal for Overdriven Inputs"). This behavior is process-dependent and verified across temperature and voltage ranges, ensuring reliable operation in comparator or protection-circuit roles where inputs may transiently exceed VSS or VDD − 1.1V.