Analog Devices Inc./Maxim Integrated LMX393AKA+

Overview

LMX393AKA+ from Maxim Integrated is a dual, open-drain, low-voltage comparator IC with internal hysteresis, designed for automotive and portable systems requiring robust noise immunity and rail-to-rail input operation down to 1.8V supply. It delivers 60 µA per comparator at 5V, 2 mV hysteresis, and operates across –40°C to +125°C in an 8-pin SOT23 package - used in battery voltage monitoring and motor overcurrent detection circuits.

For engineers reviewing the LMX393AKA+ datasheet, LMX393AKA+ pinout, LMX393AKA+ application, or LMX393AKA+ equivalent, key selection criteria include guaranteed 1.8V–5.5V operation, automotive temperature range, low output saturation voltage (≤100 mV @ 1 mA), internal hysteresis, and compatibility with LMV393-based designs.

Technical Context

The LMX393AKA+ implements a dual-channel, open-drain comparator architecture using submicron CMOS process technology. Its input stage supports common-mode voltages from –0.1 V to VDD – 0.7 V, enabling ground-sensing capability and eliminating phase reversal under overdrive conditions.

Each comparator features 2 mV of factory-trimmed internal hysteresis, optimized for noise rejection on slow-moving signals without external components. Propagation delay is 90 ns (typ) at 100 mV overdrive and 5 V supply, with PSRR of 60–70 dB across 1.8–5.5 V operation.

Key Specifications

Pinout & Package

LMX393AKA+ is housed in an 8-pin SOT23 package (package code K8F+4), measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and RoHS-compliant matte-tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMV393IDR and TLV3702IDR, the LMX393AKA+ uniquely combines automotive-grade temperature operation, factory-trimmed 2 mV hysteresis, and guaranteed 1.8 V functionality in a pin-compatible SOT23-8 package - making it optimal for safety-critical, noise-prone, and wide-supply embedded systems.

Availability

LMX393AKA+ is available at Aetrix Electronics and suitable for automotive cabin control, battery management systems, and portable device power sequencing requiring stable component supply and long-term lifecycle support.

Supply support for LMX393AKA+ 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 LMX393AKA+ belongs to Maxim's LMX3xx family of low-voltage comparators, engineered specifically for noise-immune, wide-temperature, and space-constrained sensing in automotive and portable electronics.

FAQ

What is the maximum supply voltage rating for the LMX393AKA+?

The LMX393AKA+ has an absolute maximum supply voltage of +6 V between VDD and VSS. However, its guaranteed operational range is 1.8 V to 5.5 V. Operating above 5.5 V may cause parametric degradation or latch-up, and is not supported by characterization data. For reliable long-term performance, keep VDD ≤ 5.5 V in all LMX393AKA+ applications.

Does the LMX393AKA+ require external pull-up resistors on its outputs?

Yes, the LMX393AKA+ features open-drain outputs (OUTA and OUTB), which require external pull-up resistors to define the high-state voltage level. Typical values range from 2.2 kΩ to 10 kΩ, selected based on rise time requirements and load capacitance. The LMX393AKA+ itself does not provide internal pull-ups, and omitting external resistors will result in undefined output states.

Is the LMX393AKA+ pin-compatible with the LMV393?

Yes, the LMX393AKA+ is explicitly specified as a drop-in, pin-for-pin replacement for the LMV393. Both devices use identical 8-pin SOT23 pinouts, share matching VDD, VSS, IN+, IN–, and open-drain OUT assignments, and operate across overlapping supply and temperature ranges - enabling seamless migration without PCB changes.

What is the input common-mode voltage range of the LMX393AKA+?

The LMX393AKA+ supports an input common-mode voltage range from –0.1 V to (VDD – 0.7 V). This allows direct connection to ground-referenced sources (e.g., current-sense shunts) and compatibility with signals near the negative rail. At VDD = 1.8 V, the usable input range extends from –0.1 V to 1.1 V; at VDD = 5.5 V, it spans –0.1 V to 4.8 V.

Can the LMX393AKA+ be used in place of the LMX393HAKA+?

No - the LMX393AKA+ does not include internal hysteresis, whereas the LMX393HAKA+ provides factory-trimmed 2 mV hysteresis. Substituting LMX393AKA+ for LMX393HAKA+ in noise-sensitive applications (e.g., slow-moving thermistor signals) may cause output oscillation. Hysteresis cannot be added post-fabrication; the "H" suffix denotes a distinct variant with different internal circuitry.