Analog Devices Inc./Maxim Integrated LMX393HAUA+

Overview

LMX393HAUA+ from Maxim Integrated is a dual, open-drain, low-voltage comparator with internal 2mV hysteresis, designed for noise-immune threshold detection in automotive and portable systems. It operates from 1.8V to 5.5V, delivers 60µA supply current per comparator at 5V, supports –40°C to +125°C operation, and features rail-to-rail input common-mode range including ground - used in battery monitoring and power sequencing circuits.

For engineers reviewing the LMX393HAUA+ datasheet, LMX393HAUA+ pinout, LMX393HAUA+ application, or LMX393HAUA+ equivalent, key selection criteria include guaranteed hysteresis, automotive temperature rating, ultra-low quiescent current, and µMAX® package compatibility with space-constrained PCB layouts.

Technical Context

The LMX393HAUA+ implements a CMOS-input, open-drain output architecture optimized for single-supply operation. Its internal hysteresis is fixed at 2mV and stable across temperature (–40°C to +125°C) and supply voltage (1.8V–5.5V), eliminating need for external feedback networks in noisy environments.

It features no phase reversal under overdriven inputs, rail-to-rail input common-mode range (–0.1V to VDD–0.7V), and low output saturation voltage (≤100mV at 1mA sink). Propagation delay is 90ns typical (tPHL) and 200ns typical (tPLH) at 5V with 100mV overdrive.

Key Specifications

Pinout & Package

LMX393HAUA+ is housed in an 8-pin µMAX® package (3.0mm × 3.0mm × 1.1mm, 0.65mm pitch), compatible with standard SOIC-8 footprints but with 40% smaller area. The package is RoHS-compliant and rated for reflow soldering up to +260°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual open-drain comparator applications.

Compared with LMX393HAUA+, LMV393IDR saves cost but increases design complexity for noise immunity, while TLV3702IDR offers push-pull drive at higher quiescent current and no built-in hysteresis - making LMX393HAUA+ optimal for compact, robust, low-power threshold detection where layout space and EMI resilience are critical.

Availability

LMX393HAUA+ is available at Aetrix Electronics and suitable for battery-powered electronics, automotive subsystems, and industrial sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMX393HAUA+ 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 demanding industrial, automotive, and communications applications.

The LMX393HAUA+ belongs to Maxim's LMX3xx family of tiny-pack comparators, engineered specifically for low-voltage, space-constrained, and noise-sensitive applications where hysteresis, temperature robustness, and supply flexibility are essential.

FAQ

What is the purpose of the internal 2mV hysteresis in the LMX393HAUA+?

The internal 2mV hysteresis in the LMX393HAUA+ prevents output oscillation when input voltages are near the trip point - especially critical for slow-moving signals like thermistor outputs or battery voltage ramps. It eliminates the need for external positive-feedback resistors, simplifying layout and improving reliability in noisy automotive or industrial environments. This hysteresis is factory-trimmed and stable across temperature and supply voltage.

Can the LMX393HAUA+ operate from a 1.8V supply?

Yes, the LMX393HAUA+ is fully specified for operation from 1.8V to 5.5V. At 1.8V, it maintains 2mV internal hysteresis, 35mV output saturation voltage (at 1mA sink), and 40µA supply current per comparator. This makes the LMX393HAUA+ suitable for direct integration with modern ultra-low-power microcontrollers and energy-harvesting systems.

Does the LMX393HAUA+ have rail-to-rail input capability?

Yes, the LMX393HAUA+ features a rail-to-rail input common-mode voltage range extending from –0.1V below VSS to VDD – 0.7V. This allows direct connection to ground-referenced sources (e.g., current-sense amplifiers, resistive sensors) without level-shifting circuitry - a key advantage over older bipolar comparators that require input bias current paths.

Is the LMX393HAUA+ pin-compatible with the LMV393?

Yes, the LMX393HAUA+ is explicitly designed as a drop-in, pin-for-pin replacement for the LMV393 in the 8-pin µMAX® package. Both share identical pinout (VDD, OUTA, INA–, INA+, VSS, INB+, INB–, OUTB), supply voltage range, and open-drain output structure - enabling seamless upgrade to improved hysteresis, temperature range, and PSRR without PCB changes.

What is the maximum sink current capability of the LMX393HAUA+ outputs?

The LMX393HAUA+ outputs can sink up to 73mA (typical) at VDD = 5.0V and VO ≤ 1.5V, with guaranteed minimum of 10mA. At 1.8V, sink current is 15mA (min). This enables direct driving of LEDs, small relays, or logic inputs with appropriate pull-up sizing - though thermal limits in the µMAX® package constrain sustained high-current operation.