Analog Devices Inc./Maxim Integrated MAX9051AEUT+T

Overview

MAX9051AEUT+T from Analog Devices is a micropower single-supply comparator with integrated 2.500V precision voltage reference, housed in a 6-pin SOT23 package. It delivers 40μA supply current at 2.7V, 400ns propagation delay, rail-to-rail inputs/outputs, ±3mV internal hysteresis, and 0.4% initial accuracy (A grade) for battery-powered precision threshold detection.

For engineers reviewing the MAX9051AEUT+T datasheet, MAX9051AEUT+T pinout, MAX9051AEUT+T application, or MAX9051AEUT+T equivalent, this page provides verified functional context, validated pin roles, real-world use cases in low-power sensing and level translation, and confirmed alternative options for design continuity.

Technical Context

The MAX9051AEUT+T integrates a single high-precision comparator with an uncommitted inverting input (IN−) and a dedicated 2.500V reference output (REF), enabling flexible external hysteresis or threshold-setting configurations. Its rail-to-rail input stage supports common-mode voltages from VEE − 0.25V to VCC + 0.25V, while the push-pull output drives ±8mA with VOL ≤ 0.55V (at 5V, 8mA sink) and VOH ≥ 4.45V.

Internally, the device uses laser-trimmed thin-film resistors and curvature-correction circuitry to achieve 6ppm/°C typical temperature coefficient and stability across 0–4.7nF capacitive loads on REF. The comparator features 1.0pA typical input bias current and ±0.5mV typical input offset voltage over temperature.

Key Specifications

Pinout & Package

MAX9051AEUT+T is packaged in a RoHS-compliant 6-pin SOT23 (SC-70) outline with standard land pattern 90-0175, optimized for space-constrained PCB layouts and reflow compatibility per JEDEC J-STD-020A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX9051BEUT+T, the MAX9051AEUT+T offers tighter reference stability for long-term sensor calibration, while TLV4041IDBVR demands additional components and increases BOM count-making MAX9051AEUT+T optimal for space- and power-constrained precision sensing.

Availability

MAX9051AEUT+T is available at Aetrix Electronics and suitable for precision battery management, IR receivers, window comparators, and level translators requiring stable component supply across industrial and medical product lifecycles.

Supply support for MAX9051AEUT+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 MAX9051AEUT+T belongs to the MAX9038–MAX9053 micropower comparator + reference family, engineered specifically for ultra-low-power, single-supply sensing and threshold detection in portable and battery-operated equipment.

FAQ

What is the reference voltage accuracy and temperature coefficient of the MAX9051AEUT+T?

The MAX9051AEUT+T features a 2.500V precision voltage reference with ±0.4% initial accuracy (A grade) and a typical temperature coefficient of 6ppm/°C over −40°C to +85°C. This specification is guaranteed by laser trimming and curvature correction, ensuring minimal drift in temperature-variable environments such as outdoor sensor nodes or automotive cabin modules.

Does the MAX9051AEUT+T have an open-drain or push-pull output?

The MAX9051AEUT+T has a rail-to-rail push-pull output stage capable of sourcing and sinking up to 8mA. Unlike the MAX9038, it does not feature an open-drain output. This allows direct interface with CMOS/TTL logic without external pull-up resistors, simplifying PCB layout and reducing component count in digital interface applications.

Can the MAX9051AEUT+T operate from a 2.5V supply?

No, the MAX9051AEUT+T requires a minimum supply voltage of 2.7V, as specified in its absolute maximum ratings and electrical characteristics tables. Operating below 2.7V may result in undefined reference output voltage, increased propagation delay, or failure to meet A-grade accuracy specifications. For 2.5V operation, consider the MAX9040AEUK+T (2.048V reference, 2.5V min supply).

What is the maximum capacitive load supported on the REF pin of the MAX9051AEUT+T?

The REF pin of the MAX9051AEUT+T is stable with capacitive loads up to 4.7nF, as confirmed in the Electrical Characteristics table and Applications Information section. This allows direct connection to sampling capacitors in SAR ADCs or local decoupling without risk of oscillation-no series resistance or isolation buffer is required for stability.

How does the internal hysteresis of the MAX9051AEUT+T improve noise immunity?

The MAX9051AEUT+T incorporates ±3mV internal hysteresis, which creates a 6mV dead band between rising and falling input thresholds. This prevents multiple output toggles when the input signal resides near the trip point due to noise or slow slew rates-common in thermistor or potentiometer-based circuits-eliminating the need for external positive-feedback resistors and simplifying design validation.