Analog Devices Inc./Maxim Integrated MAX9031AUK+T

Overview

The MAX9031AUK+T from Maxim Integrated is a single, rail-to-rail output comparator optimized for low-power, single-supply operation from +2.5V to +5.5V, featuring 188ns propagation delay, 35μA supply current per comparator, 4mV internal hysteresis, and operation across -40°C to +125°C - deployed in battery-powered portable systems and sensor signal detection circuits.

For engineers reviewing the MAX9031AUK+T datasheet, MAX9031AUK+T pinout, MAX9031AUK+T application, or MAX9031AUK+T equivalent, key selection criteria include its 5-pin SOT23 package, input common-mode range extending to within 1.1V of VDD, no phase reversal under overdrive, ultra-low quiescent current, and guaranteed hysteresis for noise immunity in slow-signal environments.

Technical Context

This comparator uses a CMOS input stage with rail-to-rail output swing and an internal hysteresis band of 4mV to prevent chatter on noisy or slowly varying inputs. Its input common-mode voltage range spans from VSS to (VDD – 1.1V), enabling direct interfacing with sensors operating near ground or mid-supply.

The output stage is designed to minimize switching current transients, eliminating power-supply glitches during transitions. It supports stable operation with capacitive loads up to 150pF and exhibits no phase reversal when inputs exceed common-mode limits - critical for robust threshold detection in industrial and automotive sensor interfaces.

Key Specifications

Pinout & Package

MAX9031AUK+T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+1), with exposed pad not electrically connected. Standard 0.1µF bypass capacitor recommended between VDD and VSS pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMV331IDBVR and TLV3701DBVR, the MAX9031AUK+T offers the optimal balance of speed (188ns), ultra-low power (35μA), integrated hysteresis (4mV), and rail-to-rail push-pull output - making it uniquely suited for space-constrained, battery-operated threshold detection where component count and layout simplicity are critical.

Availability

MAX9031AUK+T is available at Aetrix Electronics and suitable for battery-powered portable systems, photodiode signal discrimination, and digital line receiver applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX9031AUK+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

Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, automotive, communications, and consumer applications.

The MAX9031AUK+T belongs to Maxim's low-power, ultra-small comparator family targeting portable and sensor-interface applications - engineered for minimal footprint, single-supply operation, and guaranteed performance across extended temperature ranges.

FAQ

What is the supply voltage range for the MAX9031AUK+T?

The MAX9031AUK+T operates from a single supply of +2.5V to +5.5V, with absolute maximum ratings allowing up to +6V. It also supports dual-supply operation from ±1.25V to ±2.75V. This wide range enables direct integration with common battery chemistries and logic families without external regulation or level shifting - a key advantage in compact portable designs where the MAX9031AUK+T is frequently deployed.

Does the MAX9031AUK+T include internal hysteresis, and what is its value?

Yes, the MAX9031AUK+T features 4mV of built-in hysteresis, defined as the difference between its upper and lower trip points. This fixed hysteresis improves noise immunity and prevents output oscillation when processing slow-moving or noisy input signals - eliminating the need for external positive-feedback resistors in most threshold-detection applications using the MAX9031AUK+T.

What is the propagation delay of the MAX9031AUK+T, and under what conditions is it specified?

The MAX9031AUK+T has a typical propagation delay of 188ns when driven with a 100mV input overdrive (VOD), measured at VDD = +5V, RL = 10kΩ, CL = 15pF, and TA = +25°C. Delay increases to 228ns at 10mV overdrive. This specification ensures reliable timing in high-speed digital line receivers and photodiode pulse detection circuits where the MAX9031AUK+T is commonly applied.

Is the MAX9031AUK+T pin-compatible with other comparators in the MAX903x family?

No - the MAX9031AUK+T is a single comparator in 5-pin SOT23, while the MAX9030 includes a shutdown pin (6-pin), and the MAX9032/MAX9034 are dual/quad devices with different pin counts and layouts. Pin compatibility exists only within same-function variants (e.g., MAX9031AXK+T in SC70 shares identical pinout). The MAX9031AUK+T's 5-pin SOT23 footprint is unique to this specific variant and not interchangeable with other MAX903x packages.

What is the input common-mode voltage range of the MAX9031AUK+T?

The input common-mode voltage range of the MAX9031AUK+T extends from VSS (ground) to (VDD – 1.1V) - for example, 0V to +3.9V at VDD = +5V. This rail-to-rail input capability allows direct connection to sensors, DAC outputs, or attenuated signals without external biasing networks, simplifying front-end design in applications such as sensor signal detection where the MAX9031AUK+T is widely used.