Analog Devices Inc./Maxim Integrated MAX9042BEUA+T

Overview

MAX9042BEUA+T from Analog Devices is a dual micropower comparator with integrated 2.048V precision voltage reference, operating from 2.5V to 5.5V supply. It delivers rail-to-rail inputs/outputs, 400ns propagation delay, ±3mV internal hysteresis, and only 55µA supply current - ideal for battery-powered precision level detection in portable instrumentation.

For engineers reviewing the MAX9042BEUA+T datasheet, MAX9042BEUA+T pinout, MAX9042BEUA+T application, or MAX9042BEUA+T equivalent, key selection criteria include dual-comparator timing consistency, reference accuracy (±1% initial, 100ppm/°C tempco), rail-to-rail output drive (8mA sink/source), low quiescent current across temperature, and µMAX-8 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX9042BEUA+T integrates two independent comparators sharing a single laser-trimmed bandgap reference. Its input stage supports common-mode voltages from VEE − 0.25V to VCC + 0.25V, with typical input bias current of 1pA and offset voltage of ±1mV over temperature. Internal hysteresis ensures noise-immune switching without external components.

The output stage uses a push-pull rail-to-rail design capable of sinking and sourcing up to 8mA, minimizing supply current surges during transitions. The 2.048V reference features curvature correction, stable operation with up to 4.7nF capacitive load, and 84dB ripple rejection at 120Hz - enabling direct use in ADC reference or threshold-setting circuits without buffering.

Key Specifications

Pinout & Package

The MAX9042BEUA+T is housed in an 8-pin µMAX package (pin-compatible with SO-8 but 30% smaller footprint), with exposed paddle for thermal enhancement and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual comparator + reference applications.

Compared with MAX9042AEUA, the MAX9042BEUA+T trades reference precision for cost and simplifies qualification for less demanding applications; versus TLV3702IDR, it reduces BOM count and power by integrating the reference while maintaining µMAX-8 footprint compatibility.

Availability

MAX9042BEUA+T is available at Aetrix Electronics and suitable for precision battery management, window comparator circuits, IR receiver front-ends, level translation, and portable instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for MAX9042BEUA+T 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX9038–MAX9053 family was designed for ultra-low-power, space-constrained applications requiring integrated precision references - specifically targeting battery-operated sensors, portable medical devices, and energy-harvesting systems.

FAQ

What is the reference voltage accuracy and temperature coefficient of the MAX9042BEUA+T?

The MAX9042BEUA+T features a 2.048V reference with ±1% initial accuracy (B grade) and a temperature coefficient of 100ppm/°C over −40°C to +85°C. This means the reference voltage may drift up to ±0.85mV across the full temperature range, making it suitable for applications where moderate precision suffices, such as general-purpose threshold detection or non-critical ADC reference duties.

Can the MAX9042BEUA+T operate from a 2.7V supply, and what is its supply current at that voltage?

Yes, the MAX9042BEUA+T operates from 2.5V to 5.5V, including 2.7V. At 2.7V supply, its typical supply current is 55µA, with a maximum of 80µA over temperature. This ultra-low quiescent current enables multi-year operation in battery-powered systems like wireless sensor nodes or portable diagnostic tools where energy efficiency is critical.

Does the MAX9042BEUA+T have rail-to-rail input capability, and how far beyond the rails does it extend?

Yes, the MAX9042BEUA+T has rail-to-rail input capability with a common-mode voltage range extending 250mV beyond both supply rails - from VEE − 0.25V to VCC + 0.25V. This allows direct interfacing with signals that swing slightly below ground or above VCC, such as thermocouple outputs or partially discharged battery terminals, without external level-shifting circuitry.

What is the output drive capability of the MAX9042BEUA+T comparators, and are they push-pull or open-drain?

The MAX9042BEUA+T comparators feature rail-to-rail push-pull outputs capable of sinking and sourcing up to 8mA each. Unlike the MAX9038 (open-drain), both OUTA and OUTB can actively drive high or low without external pull-up resistors - simplifying interface to logic inputs, LEDs, or small-signal MOSFET gates in compact designs.

Is a bypass capacitor required on the VCC pin of the MAX9042BEUA+T, and what value is recommended?

A bypass capacitor is not strictly required due to the device's low supply current and glitch-resistant output design, but it is recommended when supply impedance exceeds 1Ω, supply leads are long, or noise is present. A 100nF ceramic capacitor placed as close as possible to the VCC and VEE pins provides optimal decoupling and ensures stable operation in noisy industrial or portable environments.