Analog Devices Inc./Maxim Integrated LMX393HAKA+T

Overview

LMX393HAKA+T 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, achieves 90ns propagation delay (tPHL) at 100mV overdrive, and supports -40°C to +125°C operation - ideal for battery-powered sensor monitoring and power-rail supervision.

For engineers reviewing the LMX393HAKA+T datasheet, LMX393HAKA+T pinout, LMX393HAKA+T application, or LMX393HAKA+T equivalent, key selection criteria include guaranteed hysteresis, rail-to-rail input range including ground, low output saturation voltage (70mV at 4mA), wide temperature rating, and SOT23-8 package compatibility with legacy LMV393 designs.

Technical Context

The LMX393HAKA+T implements a dual-channel, CMOS-based comparator architecture with internal hysteresis circuitry that establishes distinct rising- and falling-edge trip thresholds. Its input stage supports 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, with output saturation voltage as low as 70mV at 4mA sink current. The device uses submicron CMOS process technology to achieve superior PSRR (70dB) and CMRR versus bipolar comparators, while maintaining low quiescent current across 1.8V–5.5V supply range.

Key Specifications

Pinout & Package

LMX393HAKA+T is housed in an 8-pin SOT23 package (3.0mm × 1.7mm × 1.3mm body, 0.65mm pitch), optimized for space-constrained PCB layouts and compatible with standard SOT23 reflow profiles.

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 LMX393HAKA+T uniquely combines guaranteed internal hysteresis, automotive temperature range, and true 1.8V operation in an industry-standard SOT23-8 footprint - making it optimal for noise-critical, battery-operated, and high-reliability embedded systems where layout area and component count must be minimized.

Availability

LMX393HAKA+T is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable medical device monitoring, and industrial power-supply supervision requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMX393HAKA+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) is a semiconductor company specializing in precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.

The LMX393HAKA+T belongs to Maxim's LMX3xx family of tiny-pack comparators, engineered specifically for low-voltage, space-constrained, and noise-sensitive applications where reliability across extreme temperatures is non-negotiable.

FAQ

What is the purpose of the internal 2mV hysteresis in the LMX393HAKA+T?

The internal 2mV hysteresis in the LMX393HAKA+T establishes separate upper and lower input threshold voltages, preventing output oscillation when input signals transition slowly or contain noise near the trip point. This eliminates the need for external hysteresis resistors in applications such as battery voltage monitoring or sensor signal conditioning, simplifying design and improving board-level reliability. The hysteresis value remains stable across temperature and supply voltage variations as confirmed in the device's typical operating characteristics.

Can the LMX393HAKA+T operate from a 1.8V supply while maintaining full specification?

Yes, the LMX393HAKA+T is fully specified and guaranteed to operate from 1.8V to 5.5V. At 1.8V, it maintains 2mV internal hysteresis, 35mV output saturation voltage (at 1mA), 40µA supply current per comparator, and functional operation across the full -40°C to +125°C temperature range. These parameters are validated in the 1.8V DC and AC electrical characteristics tables of the official datasheet, confirming suitability for ultra-low-voltage microcontroller systems.

Is the LMX393HAKA+T pin-compatible with the LMV393 series?

Yes, the LMX393HAKA+T is explicitly designed as a drop-in, pin-for-pin replacement for the LMV393 series in the same SOT23-8 package. Pin functions - including OUTA, INA−, INA+, VSS, VDD, INB+, INB−, and OUTB - match identically. However, unlike the LMV393, the LMX393HAKA+T includes internal hysteresis and extends temperature rating to +125°C, offering enhanced performance without requiring PCB layout changes.

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

Each open-drain output of the LMX393HAKA+T can sink up to 73mA at VDD = 5.0V and TA = +25°C, with guaranteed minimum of 10mA across the full -40°C to +125°C range. At 1.8V operation, the sink current is rated at 15mA minimum. This high drive strength allows direct interfacing with LEDs, small relays, or logic inputs without external buffers, while the low 70mV saturation voltage at 4mA ensures minimal voltage drop and power loss.

Does the LMX393HAKA+T require external bypass capacitors, and if so, what value is recommended?

Yes, the LMX393HAKA+T requires a 0.1µF ceramic bypass capacitor placed between VDD and VSS, mounted as close as possible to the device's power pins. This is explicitly recommended in the Board Layout and Bypassing section of the datasheet to minimize supply impedance and suppress high-frequency noise coupling into the comparator inputs. For systems with particularly noisy environments or slow-moving inputs (>1ms rise time), an additional 1nF capacitor across INA+ and INA− is advised to further attenuate RF interference.