Analog Devices Inc./Maxim Integrated LMX393HAKA+

Overview

LMX393HAKA+ 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 LMX393HAKA+ datasheet, LMX393HAKA+ pinout, LMX393HAKA+ application, or LMX393HAKA+ equivalent, key selection criteria include guaranteed hysteresis, automotive temperature rating, open-drain output drive capability, and drop-in compatibility with LMV393 while improving noise immunity and PSRR.

Technical Context

The LMX393HAKA+ implements a dual-channel, CMOS-based comparator architecture with internally trimmed hysteresis (2mV) to suppress oscillation on slow or noisy inputs. Its input stage accepts common-mode voltages from –0.1V to VDD–0.7V, enabling direct ground-referenced sensing without level-shifting.

Each comparator features an open-drain output capable of sinking up to 73mA at 5V (typical), with output saturation voltage as low as 50mV at 1mA sink current. Propagation delay is 90ns (tPHL) / 200ns (tPLH) at 100mV overdrive and 5V supply, optimized for fast response in power-good and window-detection applications.

Key Specifications

Pinout & Package

LMX393HAKA+ is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and automotive modules.

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, LMX393HAKA+ uniquely integrates 2mV hysteresis and automotive-grade temperature performance in an 8-pin SOT23, eliminating design compromises between noise immunity, footprint, and qualification scope.

Availability

LMX393HAKA+ is available at Aetrix Electronics and suitable for automotive cabin control, battery management systems, and portable device power supervision requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMX393HAKA+ 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The LMX393HAKA+ belongs to Maxim's LMX3xx family of tiny-pack comparators, engineered specifically for low-voltage, high-reliability threshold detection in space- and power-constrained automotive and portable electronics.

FAQ

What is the purpose of internal hysteresis in the LMX393HAKA+?

The LMX393HAKA+ integrates 2mV of internal hysteresis to prevent output oscillation when input signals hover near the switching threshold - especially critical for slow-moving or noisy signals like battery voltage ramps or thermistor outputs. This eliminates the need for external positive-feedback resistors, simplifying design and improving reliability in automotive and portable applications where EMI is prevalent. The hysteresis is factory-trimmed and remains stable across temperature and supply voltage.

Can the LMX393HAKA+ operate from a 1.8V supply?

Yes, the LMX393HAKA+ is fully specified and guaranteed to operate from 1.8V to 5.5V. At 1.8V, it maintains 40µA supply current per comparator, 35mV output saturation voltage (at 1mA sink), and functional hysteresis - making it ideal for single-cell Li-ion and energy-harvesting systems. Input common-mode range extends down to –0.1V, supporting ground-referenced sensing even at minimum supply.

Is the LMX393HAKA+ pin-compatible with the LMV393?

Yes, the LMX393HAKA+ is a drop-in, pin-for-pin replacement for the LMV393 in the same 8-pin SOT23 package. Pin assignments (VDD, VSS, INA+, INA−, OUTA, INB+, INB−, OUTB) match exactly. However, LMX393HAKA+ adds internal hysteresis and improves PSRR, CMRR, and temperature range (–40°C to +125°C fully guaranteed), offering enhanced performance without layout changes.

What is the maximum sink current capability of each output in the LMX393HAKA+?

Each open-drain output of the LMX393HAKA+ can sink up to 73mA when VO ≤ 1.5V and VDD = 5V (typical). At 1.8V supply, sink current is 15mA under the same condition. This allows direct driving of LEDs, small-signal MOSFET gates, or logic inputs with standard pull-up resistors - eliminating buffer stages in power-good indicators and enable sequencers.

Does the LMX393HAKA+ require external bypass capacitors?

Yes, the LMX393HAKA+ requires a 0.1µF ceramic bypass capacitor placed between VDD and VSS, mounted as close as possible to the pins to minimize parasitic inductance. This is essential for stable operation, especially under fast transient loads or in noisy automotive environments. For slow-moving inputs (rise time > 1ms), a 1nF capacitor across IN+ and IN− is also recommended to suppress high-frequency noise that could trigger false trips.